Kerri Rodriguez

Interests

Research

Human-Animal InteractionHuman-Animal BondAnimal-Assisted InterventionTherapy AnimalsService DogsCompanion AnimalsDogsPsychologyTraumaMental Health

Courses

Scholarly Contributions

Chapters

• O'Haire, M., Rodriguez, K., Nieforth, L., & Mao, A. (2023). Companion animals in the treatment of autism spectrum disorder. In The Role of Companion Animals in the Treatment of Mental Disorders.. American Psychiatric Association.

Journals/Publications

• Nieforth, L. O., Rodriguez, K. E., Zhuang, R., Miller, E. A., Sabbaghi, A., Schwichtenberg, A. J., Granger, D. A., & O'Haire, M. E. (2024). The cortisol awakening response in a 3 month clinical trial of service dogs for veterans with posttraumatic stress disorder. Scientific reports, 14(1), 1664.
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  Recent literature suggests that service dogs may be a valuable complementary intervention option for posttraumatic stress disorder (PTSD) among military veterans due to the potential influence on stress response dysregulation. The aim of this short-term longitudinal study was to quantify the impact of service dogs in US military veterans with PTSD with particular attention to the cortisol awakening response. A sub aim of the study was to empirically evaluate the physiological effects of PTSD service dogs on veteran partners. We conducted a clinical trial (ID: NCT03245814) that assessed the cortisol awakening response for 245 participants at baseline and 3 months follow-up across an intervention group (service dog: veterans n = 88, partners n = 46) and control group (usual care: n = 73, partners n = 38). A total of N = 161 veterans and N = 84 partners collected whole saliva samples via a passive drool collection immediately upon waking, 30 min after waking, and 45 min after waking on three consecutive weekdays at baseline and again at follow-up. Mixed model repeated measures (MMRM) with a fixed effect of the intervention group (service dog or control) were utilized. Covariates considered for the model included time of awakening, sleep duration, sleep efficiency, prior day experiences (measured via ecological momentary assessment), traumatic brain injury, age, gender, race, ethnicity, socioeconomic status, smoking status, alcohol use, physical health, and body mass index. A total of 3951 salivary samples were collected (veterans: 2613, partners: 1338). MMRM results demonstrated that veterans with a service dog had a statistically significant higher cortisol awakening response, including the area under the curve with respect to both increase (AUCi, β = 1.46, p = 0.046) and absolute increase (AINC, β = 0.05, p = 0.035). Results were not statistically significant for partners. Findings suggest that veterans with service dogs have a higher, less blunted CAR in comparison to veterans receiving usual care alone. In veterans with a blunted morning cortisol response, service dog placement could help boost their morning cortisol response.
• Leighton, S. C., Rodriguez, K. E., Nieforth, L. O., & O'Haire, M. E. (2023). Service dogs for autistic children and family system functioning: a constant comparative analysis. Frontiers in psychiatry, 14, 1210095.
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  Service dog placements for autistic children are growing in popularity, yet findings to date are mixed. Moreover, no study to date has examined these placements through the lens of a recognized theoretical model. The purpose of this study is twofold: to explore experiences reported by caretakers of autistic children involved in a service dog program, and to contextualize findings within an established theoretical framework.
• Leighton, S. C., Rodriguez, K. E., Zhuang, R., Jensen, C. L., Miller, E. A., Sabbaghi, A., & O'Haire, M. E. (2023). Psychiatric service dog placements are associated with better daily psychosocial functioning for military veterans with posttraumatic stress disorder. Psychological trauma : theory, research, practice and policy.
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  Psychiatric service dog placements may benefit psychosocial functioning for veterans with posttraumatic stress disorder (PTSD), however, these effects have never been examined directly in daily life. This nonrandomized longitudinal clinical trial quantified the efficacy of psychiatric service dogs for daily psychosocial functioning among = 168 veterans with PTSD using ecological momentary assessment (EMA).
• Nieforth, L. O., Rodriguez, K. E., & O'Haire, M. E. (2023). Benefits and challenges of mobility and medical alert service dogs for caregivers of service dog recipients. Disability and rehabilitation. Assistive technology, 18(6), 743-751.
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  Mobility and medical alert service dogs are an assistive technology for individuals with disabilities or chronic conditions. Informal caregivers of individuals with disabilities are subject to physical and emotional stress due to their responsibilities. Understanding how service dogs, an increasingly common assistive technology, may add to or subtract from caregiver stress is crucial for promoting caregiver well-being. The purpose of this study was to analyze caregiver accounts to understand their perspective on benefits and challenges they face with mobility and medical alert service dogs.
• Rodriguez, K. E., Graham, D. J., & Lucas-Thompson, R. G. (2023). The Effect of Mental Activation of One's Pet Dog on Stress Reactivity. International journal of environmental research and public health, 20(21).
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  Research suggests that mental activation of human social support may reduce stress reactivity. However, the extent to which social support from pets elicits a similar effect has been less explored. This study aims to determine whether the mental activation of one's pet dog reduces stress reactivity to a subsequent experimental stressor. In a 2 × 2 design, 132 dog-owning participants (M = 20.14; 80% female) were randomly assigned to one of two mental activation conditions (pet dog; general) and one of two stressor conditions (social-evaluative; cognitive). Data were analyzed with two-way ANOVAs with self-reported (positive/negative affect, negative self-evaluation) and physiological (blood pressure, heart rate) dependent variables. Results indicated that participants randomized to the pet dog mental activation condition had smaller decreases in positive affect from baseline to post-stressor compared to the general mental activation condition. However, there were no significant interactions between time and mental activation condition on negative affect, negative self-evaluation, heart rate, or blood pressure. Thus, the mental activation of one's pet dog had a minimal effect on stress reactivity to a cognitive or social-evaluative stressor. Results suggest that the physical presence of an animal may be an essential mechanism underlying the benefits of animal-derived social support.
• Brown, S. M., Rodriguez, K. E., Smith, A. D., Ricker, A., & Williamson, A. A. (2022). Associations between childhood maltreatment and behavioral sleep disturbances across the lifespan: A systematic review. Sleep medicine reviews, 64, 101621.
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  Childhood maltreatment has a range of long-term developmental and health consequences. Emerging research suggests that sleep disturbances may be a key behavioral health risk factor implicated in the relationship between maltreatment and poor health across the lifespan. This systematic review examined the association between maltreatment and behavioral sleep disturbances in childhood and adulthood. Studies were identified through PsycINFO, PubMed, and alternative search strategies such as Google Scholar and reference list checks, with an end date of July 2021. Quantitative, peer-reviewed articles examining behavioral sleep outcomes and/or characteristics among maltreatment-exposed samples were included. We assessed the potential risk of bias by examining study design and sleep and maltreatment assessment methods. Across 73 studies included in this review, there was a robust association between childhood maltreatment and behavioral sleep disturbances. Findings suggest that linkages between maltreatment and sleep outcomes diverge with respect to maltreatment characteristics, type of behavioral sleep disturbance assessed, use of subjective versus objective measures, and study design. Given that behavioral sleep disturbances are modifiable, more research is needed that incorporates objective measures of sleep and longitudinal designs to identify specific points of intervention to mitigate the potential long-term impacts of childhood maltreatment on health across socio-demographically diverse populations.
• Howell, T. J., Nieforth, L., Thomas-Pino, C., Samet, L., Agbonika, S., Cuevas-Pavincich, F., Fry, N. E., Hill, K., Jegatheesan, B., Kakinuma, M., MacNamara, M., Mattila-Rautiainen, S., Perry, A., Tardif-Williams, C. Y., Walsh, E. A., Winkle, M., Yamamoto, M., Yerbury, R., Rawat, V., , Alm, K., et al. (2022). Defining Terms Used for Animals Working in Support Roles for People with Support Needs. Animals : an open access journal from MDPI, 12(15).
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  The nomenclature used to describe animals working in roles supporting people can be confusing. The same term may be used to describe different roles, or two terms may mean the same thing. This confusion is evident among researchers, practitioners, and end users. Because certain animal roles are provided with legal protections and/or government-funding support in some jurisdictions, it is necessary to clearly define the existing terms to avoid confusion. The aim of this paper is to provide operationalized definitions for nine terms, which would be useful in many world regions: "assistance animal", "companion animal", "educational/school support animal", "emotional support animal", "facility animal", "service animal", "skilled companion animal", "therapy animal", and "visiting/visitation animal". At the International Society for Anthrozoology (ISAZ) conferences in 2018 and 2020, over 100 delegates participated in workshops to define these terms, many of whom co-authored this paper. Through an iterative process, we have defined the nine terms and explained how they differ from each other. We recommend phasing out two terms (i.e., "skilled companion animal" and "service animal") due to overlap with other terms that could potentially exacerbate confusion. The implications for several regions of the world are discussed.
• Jensen, C. L., Rodriguez, K. E., MacLean, E. L., Abdul Wahab, A. H., Sabbaghi, A., & O'Haire, M. E. (2022). Characterizing veteran and PTSD service dog teams: Exploring potential mechanisms of symptom change and canine predictors of efficacy. PloS one, 17(7), e0269186.
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  Psychiatric service dogs are an emerging complementary intervention for posttraumatic stress disorder (PTSD). Initial evidence suggests that partnership with a service dog may be related to less PTSD symptom severity. However, it remains unclear how or why this might occur. To address this gap, we conducted a longitudinal investigation of 82 post-9/11 military members or veterans and their PTSD service dogs to (1) evaluate service dog characteristics as potential predictors of efficacy, (2) assess dog and human characteristics as potential predictors of veteran-dog bond, and (3) explore potential mechanisms for mental health outcomes. Aim 1 results demonstrated that most service dog characteristics did not predict veterans' mental health outcomes, but lower service dog excitability was associated with less PTSD symptom severity at follow-up. Aim 2 results showed that closer dog-veteran relationships were associated with less excitable dog temperament. Aim 3 results indicated that worse mental health at follow-up was associated with greater use of the specifically trained PTSD service dog task to initiate a social greeting ("make a friend"), whereas better mental health was related to less use of dominance-based training methods, lower perceived emotional/logistical costs of service dog partnership, and closer veteran-dog relationships. More frequent use of the trained service dog task to signal when someone approaches from behind (cover/watch back) was associated with greater anxiety, but less PTSD symptom severity. Overall, veterans spent an average of 82% of their time with service dogs (assessed via Bluetooth proximity between dog collar and veteran smartphone), and most frequently asked their service dogs to perform the trained task for calming their anxiety (calm/comfort anxiety). The present study provides subjective and objective metrics of the heterogeneity among veteran-service dog dyads while also suggesting which of the assessed metrics might be potential mechanisms involved in the intervention.
• Nieforth, L. O., Rodriguez, K. E., & O'Haire, M. E. (2022). Expectations versus experiences of veterans with posttraumatic stress disorder (PTSD) service dogs: An inductive conventional content analysis. Psychological trauma : theory, research, practice and policy, 14(3), 347-356.
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  [Correction Notice: An Erratum for this article was reported in Vol 14(3) of (see record 2022-33825-001). In this article, the length of time in which service dogs had been paired with Veterans was reported incorrectly in the third paragraph under the "Participants" heading of the "Methods" section whereby the sentence "Participants with a service dog had received their PTSD service dog an average of 51.5 months prior to participating in the study (range = 3-121.7 months, = 33.3)." should have read "Participants with a service dog had received their PTSD service dog an average of 20.9 months prior to participating in the study (range = 1.2-46.23 months, = 13.18)." All versions of this article have been corrected.] The objective of this study was twofold: to describe the benefits and drawbacks of a posttraumatic stress disorder (PTSD) service dog from the perspective of Veterans with service dogs and to compare these reports to the expectations of Veterans who were on a waitlist for a PTSD service dog. A total of 128 U.S. post-9/11 Veterans with PTSD were recruited from a nonprofit service dog provider (K9s for Warriors), including = 69 with a PTSD service dog and = 59 on the waitlist. Participant responses to open-ended survey questions were analyzed with conventional content analysis and classified into 214 codes across six subthemes, creating three larger themes. A subset (20%) of the data was independently coded to establish interrater reliability (Cohen's κ = .804). Frequency data were used to compare theme and subtheme prevalence between groups. Veterans' experiences and expectations were centered on the effects the service dogs had on Veteran mental health, human-dog interaction, and the associated drawbacks. Although the majority of Veterans reported benefits from their service dogs, the findings revealed that Veterans on the waitlist more frequently mentioned benefits than those with a service dog. Study findings suggest that the drawbacks expected from service dogs differ from the drawbacks experienced. Understanding expectations versus experiences provides critical information for mental health professionals who are informing Veterans on individualized interventions for PTSD. This knowledge will enable professionals to temper expectations and educate Veterans on specific benefits and drawbacks so that they have a more rounded view of PTSD service dogs. (PsycInfo Database Record (c) 2022 APA, all rights reserved).
• Rodriguez, K. E., Bibbo, J., & O'Haire, M. E. (2022). Perspectives on facility dogs from pediatric hospital personnel: A qualitative content analysis of patient, family, and staff outcomes. Complementary therapies in clinical practice, 46, 101534.
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  An increasing number of children's hospitals feature full-time resident facility dogs, which are specially trained to work alongside pediatric healthcare professionals to improve the patient experience. This qualitative study aimed to describe the role that facility dogs play in the lives of patients, families, and hospital staff. A total of N = 73 pediatric healthcare professionals that worked with 46 facility dogs across 17 children's hospitals in the US completed a set of open-ended questions in an online survey. Responses were analyzed via a conventional thematic analysis and organized into themes and sub-themes. Facility dogs were described to benefit pediatric healthcare professionals' daily lives through improving stress and wellbeing, staff relationships, and job-related morale. Negative impacts included increased burdens and responsibilities in the workplace. Facility dogs were also described to benefit patients and families by helping build rapport, providing a comforting presence and positive resource, and normalizing the hospital environment. In conclusion, facility dog programs were found to be a promising complementary intervention to benefit both staff as well as and patients and families. Future research is warranted to examine short-term and long-term implications of facility dog programs for staff, patient, and family wellbeing.
• Gee, N. R., Rodriguez, K. E., Fine, A. H., & Trammell, J. P. (2021). Dogs Supporting Human Health and Well-Being: A Biopsychosocial Approach. Frontiers in veterinary science, 8, 630465.
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  Humans have long realized that dogs can be helpful, in a number of ways, to achieving important goals. This is evident from our earliest interactions involving the shared goal of avoiding predators and acquiring food, to our more recent inclusion of dogs in a variety of contexts including therapeutic and educational settings. This paper utilizes a longstanding theoretical framework- the biopsychosocial model- to contextualize the existing research on a broad spectrum of settings and populations in which dogs have been included as an adjunct or complementary therapy to improve some aspect of human health and well-being. A wide variety of evidence is considered within key topical areas including cognition, learning disorders, neurotypical and neurodiverse populations, mental and physical health, and disabilities. A dynamic version of the biopsychosocial model is used to organize and discuss the findings, to consider how possible mechanisms of action may impact overall human health and well-being, and to frame and guide future research questions and investigations.
• Jensen, C. L., Bibbo, J., Rodriguez, K. E., & O'Haire, M. E. (2021). The effects of facility dogs on burnout, job-related well-being, and mental health in paediatric hospital professionals. Journal of clinical nursing, 30(9-10), 1429-1441.
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  To examine the effect of working with a facility dog on paediatric healthcare professionals' work-related burnout, job perceptions and mental health.
• Rodriguez, K. E., Anderson, L. M., Ott, C. A., & O'Haire, M. E. (2021). The Effect of a PTSD Service Dog on Military Veterans' Medication Regimens: A Cross-Sectional Pilot Study. Anthrozoos, 34(3), 393-406.
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  Recent research suggests that service dogs may have clinically-relevant benefits for military veterans with posttraumatic stress disorder (PTSD). However, the effects of PTSD service dogs on veterans' medication use has been largely unexplored. The objective of this study was to quantify the effect of PTSD service dogs on medication use among a population of military veterans with PTSD. In a cross-sectional design, United States post-9/11 military veterans with PTSD were recruited from a single service dog provider including veterans living with a PTSD service dog ( = 52) and veterans on the waitlist ( = 44). Both populations of veterans received treatment as usual. Participants completed an online survey of self-reported medication regimens and medication changes. Regression models quantified the effect of having a service dog on physical health, mental health, pain, and sleep medications while controlling for confounding variables (age, sex, relationship status, traumatic brain injuries, and physical health). Results indicated that there were no significant effects of having a service dog on overall self-reported medication use nor any specific medication category ('s > 0.06). However, veterans with a service dog were more likely than those on the waitlist to report that their doctor had decreased dosage or removed medications since getting their service dog. The results of this preliminary cross-sectional research should be interpreted with caution, as future within-subject and pharmacy-verified research is necessary to understand the causality of these findings.
• Rodriguez, K. E., Greer, J., Yatcilla, J. K., Beck, A. M., & O'Haire, M. E. (2021). Correction: The effects of assistance dogs on psychosocial health and wellbeing: A systematic literature review. PloS one, 16(8), e0256071.
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  [This corrects the article DOI: 10.1371/journal.pone.0243302.].
• Rodriguez, K. E., McDonald, S. E., & Brown, S. M. (2021). Relationships among Early Adversity, Positive Human and Animal Interactions, and Mental Health in Young Adults. Behavioral sciences (Basel, Switzerland), 11(12).
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  Adverse childhood experiences (ACEs) are associated with poor mental health. Emerging research demonstrates the protective role of positive childhood experiences, including a positive sense of self and relationships with both humans and animals, in mitigating the impacts of early life adversity on mental health outcomes. This study examined whether benevolent childhood experiences (BCEs) or relationships and interactions with pets during childhood moderated the link between ACEs and current mental health symptoms in a sample of young adults. Students ( = 214) recruited from a public university in the U.S. completed an online survey. The results showed that ACEs were significantly associated with worse mental health symptoms, including anxiety and depression. Neither emotional closeness to a childhood pet dog nor positive interactions with a childhood pet were significant moderators of the relationship between ACEs and mental health. In contrast, more BCEs were associated with better mental health, and their interaction with ACEs was significant such that adversity-exposed young adults with high BCEs reported fewer mental health symptoms than those with low BCEs. The results highlight the need for continued research on differential experiences that may be protective in the relationship between adversity exposures and mental health.
• Jensen, C. L., Rodriguez, K. E., & O'Haire, M. E. (2020). Service Dogs for Veterans and Military Members With Posttraumatic Stress Disorder: Replication With the PTSD Checklist for DSM-5. Journal of traumatic stress.
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  Psychiatric service dogs are an emerging complementary intervention for veterans and military members with posttraumatic stress disorder (PTSD). Recent cross-sectional studies have documented significant, clinically relevant effects regarding service dogs and PTSD symptom severity. However, these studies were conducted using the PTSD Checklist (PCL) for the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM). The present study aimed to replicate and advance these findings using the latest version of the PCL for the fifth edition of the DSM (PCL-5). Participants included 186 military members and veterans who had received a PTSD service dog (n = 112) or who were on the waitlist to receive one in the future (n = 74). A cross-sectional design was used to investigate the association between having a service dog and PCL-5 total and symptom cluster scores. After controlling for demographic variables, there was a significant association between having a service dog and lower PTSD symptom severity both in total, B = -14.52, p < .001, d = -0.96, and with regard to each symptom cluster, ps < .001, ds = -0.78 to -0.94. The results replicated existing findings using the largest sample size to date and the most recent version of the PCL. These findings provide additional preliminary evidence for the efficacy of service dogs as a complementary intervention for military members and veterans with PTSD and add to a growing body of foundational research serving to rationalize investment in the further clinical evaluation of this emerging practice.
• McCall, C. E., Rodriguez, K. E., Wadsworth, S. M., Meis, L. A., & O'Haire, M. E. (2020). "A Part of Our Family"? Effects of Psychiatric Service Dogs on Quality of Life and Relationship Functioning in Military-Connected Couples. Military behavioral health, 8(4), 410-423.
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  Posttraumatic stress disorder (PTSD) can have corrosive impacts on family relationships and individual functioning. Emerging evidence has shown that psychiatric service dogs may be an effective complementary treatment for military veterans with PTSD, benefiting veterans' mental and social health. However, few studies have examined the effects of psychiatric service dogs on the family members of veterans, specifically their partners. Mixed-methods data from 60 veteran-partner dyads examined individual and relationship functioning among partners of veterans paired with a service dog (service dog group; = 37) and those awaiting placement (waitlist group; = 23). While there were no statistically significant differences across groups, the effect sizes for group differences suggested that partners in the service dog group (relative to those on the waitlist) may experience higher levels of resilience and companionship, and lower levels of anger, social isolation, and work impairment. A topical survey of partner qualitative data within the service dog group indicated that service dogs provided more benefits than challenges. Partners reported improvements in veteran functioning, family relationships, and partners' quality of life. Results, although preliminary, suggest that psychiatric service dogs may provide modest positive experiences for some veteran family systems.
• Rodriguez, K. E., Bibbo, J., & O'Haire, M. E. (2020). The effects of service dogs on psychosocial health and wellbeing for individuals with physical disabilities or chronic conditions. Disability and rehabilitation, 42(10), 1350-1358.
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  To evaluate the effects of service dogs on psychosocial health and indicators of wellbeing among individuals with physical disabilities or chronic conditions. A total of 154 individuals participated in a cross-sectional survey including 97 placed with a mobility or medical service dog and 57 on the waitlist to receive one. Hierarchical regression evaluated the effect of having a service dog on standardized measures of psychosocial health (Pediatric Quality of Life Inventory) as well as anger, companionship, and sleep disturbance (Patient Reported Outcome Measurement Information System). Among those with a service dog, the Monash Dog-Owner Relationship Scale quantified the human-animal bond. Results indicated that compared to those on the waitlist, individuals with a service dog exhibited significantly better psychosocial health including higher social, emotional, and work/school functioning. There was no significant effect of having a service dog on anger, companionship, or sleep disturbance. Among those with a service dog, emotional closeness, dog-owner interaction, and amount of time since the service dog was placed were weak correlates of outcomes. Findings suggest that service dogs may have measurable effects on specific aspects of psychosocial health for individuals with physical disabilities or chronic conditions.Implications for rehabilitationHealth care providers should recognize that in addition to the functional benefits service dogs are trained to provide, they can also provide their handlers with psychosocial benefits from their assistance and companionship.Results indicate that having a service dog was related to better emotional functioning, social functioning, and work/school functioning. Areas with no significant relationship with having a service dog included social companionship, sleep, and anger.Although findings are from a large and representative sample of mobility and medical service dogs, there may be individual differences in how service dogs affect the psychosocial health of their handlers.
• Rodriguez, K. E., Bibbo, J., Verdon, S., & O'Haire, M. E. (2020). Mobility and medical service dogs: a qualitative analysis of expectations and experiences. Disability and rehabilitation. Assistive technology, 15(5), 499-509.
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  To qualitatively describe and compare the expectations and experiences of living with a mobility or medical service dog among those with a physical disability or chronic condition. A total of 64 participants living with a service dog and 27 on the waitlist to receive a service dog participated in a cross-sectional open-ended survey. Qualitative content analysis was used to identify themes and sub-themes. A total of 101 codes were summarized into themes of Physical Benefits, Psychosocial Benefits, and Drawbacks to having a service dog. Psychosocial benefits included the human-animal relationship as well as emotional, quality of life, and social benefits. Drawbacks included service dog care, public access and education, lifestyle adjustments, and dog behaviour. While participants on the waitlist were more likely to anticipate physical benefits of having a service dog, those with a service dog largely described psychosocial benefits. Findings also suggest that some drawbacks, such as public discrimination, may be unanticipated by the waitlist. A comparison of expectations and experiences of service dog ownership highlights both the positive and negative aspects of the service dog-owner relationship and identifies potential aspects of having a service dog that may be unanticipated or overestimated by those on the waitlist.Implications for RehabilitationWhen asked about helpful and important aspects of having a service dog, 98% of service dog owners described the psychosocial benefits of their dog's assistance and companionship.The human-animal relationship was the most discussed psychosocial benefit from both current owners as well as those on the waitlist, demonstrating the unique strength of the service dog-owner bond in this population.Those on the waitlist to receive a service dog did not anticipate as many drawbacks as current owners described. In particular, difficulties with public access and education as well as dog behaviour were commonly experienced, but not expected, drawbacks to service dog ownership.Findings identify aspects of having a service dog that may be unanticipated or overestimated by those on the waitlist, providing rehabilitation professionals with a basis for preparing those who may be considering incorporating a service dog into their lives.
• Rodriguez, K. E., Greer, J., Yatcilla, J. K., Beck, A. M., & O'Haire, M. E. (2020). The effects of assistance dogs on psychosocial health and wellbeing: A systematic literature review. PloS one, 15(12), e0243302.
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  Beyond the functional tasks that assistance dogs are trained for, there is growing literature describing their benefits on the psychosocial health and wellbeing of their handlers. However, this research is not only widely disparate but, despite its growth, has not been reviewed since 2012. Our objective was to identify, summarize, and methodologically evaluate studies quantifying the psychosocial effects of assistance dogs for individuals with physical disabilities. Following PRISMA guidelines, a systematic review was conducted across seven electronic databases. Records were independently screened by two authors. Studies were eligible for inclusion if they assessed outcomes from guide, hearing, medical, or mobility service dogs, if they collected original data on handlers' psychosocial functioning, and if the outcome was measured quantitatively with a validated, standardized measure. Studies on psychiatric service dogs, emotional support dogs, and pet dogs were excluded. Of 1,830 records screened, 24 articles were identified (12 publications, 12 theses) containing 27 studies (15 cross-sectional, 12 longitudinal). Studies assessed the effects of mobility (18), hearing (7), guide (4), and medical (2) assistance dog partnerships with an average sample size of N = 83. An analysis of 147 statistical comparisons across the domains of psychological health, quality of life, social health, and vitality found that 68% of comparisons were null, 30% were positive in the hypothesized direction, and 2% were negative. Positive outcomes included significant effects of having an assistance dog on psychological wellbeing, emotional functioning, self-esteem, and vitality. However, it is of note that several methodological weaknesses of the studies make it difficult to draw any definitive conclusions, including inadequate reporting and a failure to account for moderating or confounding variables. Future research will benefit from stronger methodological rigor and reporting to account for heterogeneity in both humans and assistance dogs as well as continued high-quality replication.
• Rodriguez, K. E., Herzog, H., & Gee, N. R. (2020). Variability in Human-Animal Interaction Research. Frontiers in veterinary science, 7, 619600.
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  The field of Human-Animal Interaction (HAI) is plagued with mixed results. Some findings appear to indicate that interacting with a companion animal is beneficial for some aspect of human health and well-being, while other research outcomes are inconclusive or even indicate the opposite. The purpose of this paper is to take a closer look at this variability in research outcomes and to provide plausible explanations and potential remedies. Some of the reasons for mixed results are likely due to the wide variety of methodologies implemented, intermittent use of standardized measures and manualized protocols, variability in human and animal participants, and limited quantification of human-animal interactions or definitions of pet ownership. Variability in research outcomes is not unique to HAI and is, in fact, not uncommon in many more established fields such as psychology and medicine. However, the potential reasons for the variability may be linked to the unique nature of HAI in that, in its' simplest form, it involves two complex organisms, a human and an animal, interacting in dynamic ways. We argue that this complexity makes research in this field particularly challenging and requires a broad spectrum of theoretical and methodological considerations to improve rigor while ensuring the validity and reliability of conclusions drawn from study results.
• Rodriguez, K. E., LaFollette, M. R., Hediger, K., Ogata, N., & O'Haire, M. E. (2020). Defining the PTSD Service Dog Intervention: Perceived Importance, Usage, and Symptom Specificity of Psychiatric Service Dogs for Military Veterans. Frontiers in psychology, 11, 1638.
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  Research suggests that psychiatric service dogs may be an effective complementary treatment option for military veterans with posttraumatic stress disorder (PTSD). Although this practice continues to increase in popularity and research has reached the rigor of clinical trials, the components of the PTSD service dog intervention remain largely undefined. This research aimed to (1) quantify the importance, usage, and PTSD symptom specificity of service dog trained and untrained behaviors, (2) explore how PTSD severity, time since receiving the service dog, and the veteran-dog relationship relate to outcomes, and (3) compare expectations of veterans on the waitlist to experiences of veterans with service dogs. In a cross-sectional design, 217 post-9/11 military veterans with PTSD were recruited from a national service dog provider, including = 134 with a service dog and = 83 on the waitlist. Results showed that the service dog's trained tasks of calming and interrupting anxiety were perceived as the most important for veterans' PTSD, the most frequently used in a typical day, and as helping the most PTSD symptoms. Trained tasks were most helpful to the PTSD symptoms of hypervigilance and intrusion, and least helpful toward the symptoms of amnesia and risk-taking. Although all trained tasks were helpful toward PTSD symptoms, veterans rated the service dog's untrained behaviors on average as more important for their PTSD. After controlling for covariates, there was no relationship between a veteran's PTSD severity and perceived importance or frequency of task use. However, veterans who reported feeling closer to their service dogs reported using trained tasks more often, and veterans who had their service dogs for longer reported using trained tasks less often. Finally, veterans on the waitlist reported higher expectations regarding task use and importance than described by veterans with a service dog. In conclusion, findings describe the core components of the PTSD service dog intervention by quantifying the use and value of trained and untrained dog behaviors. Overall, this study helps explain the PTSD service dog's clinically relevant value while contributing to the scientific understanding of this emerging practice.
• Bibbo, J., Rodriguez, K. E., & O'Haire, M. E. (2019). Impact of Service Dogs on Family Members' Psychosocial Functioning. The American journal of occupational therapy : official publication of the American Occupational Therapy Association, 73(3), 7303205120p1-7303205120p11.
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  A growing body of evidence supports service dogs' positive psychosocial impact on people with a chronic condition, but very little is known about the effect of service dogs on the family members with whom they live.
• LaFollette, M. R., Rodriguez, K. E., Ogata, N., & O'Haire, M. E. (2019). Military Veterans and Their PTSD Service Dogs: Associations Between Training Methods, PTSD Severity, Dog Behavior, and the Human-Animal Bond. Frontiers in veterinary science, 6, 23.
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  Psychiatric service dogs are increasingly being sought out by military veterans as a complementary intervention for posttraumatic stress disorder (PTSD). After receiving a service dog, many veterans continue training their service dog at home. Our objective was to explore the associations between training methods, PTSD severity, service dog behavior, and the veteran-service dog bond in a population of military veterans with PTSD. Post-9/11 military veterans with PTSD who had received a psychiatric service dog were recruited from a national service dog provider. A total of 111 veterans ( = 40.1 ± 8.3 years, 80% male) participated in an online survey regarding frequency of training methods, PTSD symptom severity, service dog behavior, and the human-animal bond. Service dogs were predominately Labrador Retriever purebreds or mixes of various breeds (66% male) and mostly obtained from shelters or rescues (58%). Training methods were divided into five categories: positive reinforcement (e.g., physical praise), negative punishment (e.g., ignoring the dog), positive punishment (e.g., verbal correction), dominance (e.g., alpha roll), and bond-based (e.g., co-sleeping). Data were analyzed using general linear models. Veterans self-reported using all five categories of training methods at least once a month. More frequent use of positive punishment was associated with less closeness with their service dog ( = 0.02), more fear ( = 0.003), less eye contact ( < 0.0001), and less trainability ( = 0.04). More frequent use of positive reinforcement was associated with higher closeness to their service dog ( = 0.002) and perceived increased attachment behavior ( = 0.002) and playfulness ( = 0.002). More frequent use of bond-based methods was associated with higher closeness to their service dog ( = 0.02). PTSD severity was not significantly associated with reported dog behavior, temperament, or veteran-service dog closeness. Military veterans with PTSD service dogs reported using many training methods that were associated with different outcomes. In general, the reported use of positive reinforcement or bond-based training methods were associated with reporting more positive outcomes while the reported use of positive punishment was associated with reporting more negative outcomes. Educating service dog organizations and recipients about the impacts of training methods could be beneficial for service dog efficacy and welfare.
• Rodriguez, K. E., Bryce, C. I., Granger, D. A., & O'Haire, M. E. (2018). The effect of a service dog on salivary cortisol awakening response in a military population with posttraumatic stress disorder (PTSD). Psychoneuroendocrinology, 98, 202-210.
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  Recent studies suggest a therapeutic effect of psychiatric service dogs for military veterans with posttraumatic stress disorder (PTSD), but are limited by self-report biases. The current study assessed the effect of PTSD service dogs on the salivary cortisol awakening response (CAR) and arousal-related functioning in a population of military veterans with PTSD. Participants included 73 post-9/11 military veterans with PTSD including 45 with a service dog and 28 on the waitlist to receive one. Saliva samples were collected on two consecutive weekday mornings at awakening and 30 min later to quantify the cortisol awakening response (CAR) and its area under the curve (AUCi) in addition to standardized survey measures of anxiety, anger, sleep quality and disturbance, and alcohol abuse. There was a significant main effect of having a service dog on both the CAR and the AUCi, with individuals with a service dog exhibiting a higher CAR and AUCi compared to those on the waitlist. Results also revealed that those with a service dog reported significantly lower anxiety, anger, and sleep disturbance as well as less alcohol abuse compared to those on the waitlist, with medium to large effect sizes. Although those with a service dog reported significantly less PTSD symptom severity, CAR was not significantly associated with PTSD symptoms within or across group. In conclusion, results indicate that the placement of a PTSD service dog may have a significant positive influence on both physiological and psychosocial indicators of wellbeing in military veterans with PTSD. Although clinical significance cannot be confirmed, a higher CAR/AUCi among those with a service dog may indicate better health and wellbeing in this population. Future within-subject, longitudinal research will be necessary to determine potential clinical significance and impact of individual differences.

Presentations

• Rodriguez, K., & Brown, S. (2023). Relationships between adverse child experiences and pet-related variables among a sample of children and adolescents in the US. . International Society for Anthrozoology (ISAZ). Edinburgh, UK.
• Rodriguez, K., Leighton, S., Zhuang, R., Jensen, C., Miller, E., & Sabbaghi, A. (2023). Psychiatric service dog placements are associated with better daily psychosocial functioning for military veterans with PTSD. International Society for Anthrozoology (ISAZ). Edinburgh, UK.
• Rodriguez, K., Nieforth, L., O'Haire, M., Zhuang, R., Sabbaghi, A., Schwichtenberg, A., & Miller, E. (2023). A longitudinal analysis of the cortisol awakening response in a population of military veterans with and without psychiatric service dogs for posttraumatic stress disorder. International Society for Anthrozoology (ISAZ). Edinburgh, UK.