The Effects of Therapy Dogs on Child Biology and Behavior
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ClinicalTrials.gov Identifier: NCT03949569 |
Recruitment Status :
Recruiting
First Posted : May 14, 2019
Last Update Posted : September 25, 2019
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Condition or disease | Intervention/treatment | Phase |
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Stress Reaction Behavior, Social | Behavioral: Therapy Dog Behavioral: Stuffed Toy Dog | Not Applicable |
The central goal of the study is to determine whether brief interactions with a therapy dog have an immediate impact on children's biological response to stress, prosocial behaviors, and self-reported mood in comparison to interactions with a stuffed toy dog. The study uses a randomized crossover design with two study arms; all children will receive the both interventions during the same session, with the timing of the intervention randomized across subject. All outcomes will be assessed during a single study visit. No follow-up data will be collected.
The study uses both between-group and within-subject comparisons. Between groups, the investigators predict that children who interact with a therapy dog prior to a psychosocial stress task (Arm 1) will show attenuated cortisol response to the stress task (primary outcome) and reduced physiological stress (secondary outcomes) compared to children who interact with a stuffed toy dog prior to the psychosocial stress task (Arm 2). Conversely, children who interact with the therapy dog immediately prior to the in-lab behavior tasks (Arm 2) will show higher levels of behavioral carefulness and prosocial behavior (primary outcomes) compared to children who interact with the stuffed toy dog prior to the behavior tasks (Arm 1).
Within subjects across both study arms, increases in positive mood and decreases in negative mood (secondary outcomes) will be greatest following interaction with the therapy dog compared to the stuffed toy dog, after controlling for main effects of study arm. Within subjects, physiological markers of stress (secondary outcomes) will be lower during the interaction with the therapy dog than during interaction with the stuffed toy dog.
Investigators will seek additional funds to collect and analyze salivary oxytocin data. The hypothesis is that children will show greater increase in oxytocin following interaction with the therapy dog in comparison to interaction with the stuffed toy dog.
This study will also investigate the mechanisms through which child-dog interactions influence youth stress responsivity, using coded videotaped data from the subset of children in Arm 1 who interact with the therapy dog prior to the psychosocial stress task. It is hypothesized that child behaviors observed during the interaction, such as duration and frequency of eye gaze, petting and stroking behaviors, and use of positive affect, will be inversely correlated with change in cortisol response to stress. Dog behaviors, such as duration and frequency of eye gaze and approach behaviors, will be inversely correlated with children's change in cortisol response to stress.
The study will also investigate whether child characteristics moderate the effects of the child-dog interaction. Investigators hypothesize that the effects of the therapy dog intervention will be stronger among children who currently live with dogs versus non-dog owning children and among children with more positive attitudes towards pets. It is also expected that the effects of the therapy dog interaction will be weaker among children with internalizing problems and for children experiencing higher levels of general stress. Investigators will also test whether the effects of the therapy dog intervention vary across child gender, race/ethnicity, or socioeconomic status, or child personality.
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 220 participants |
Allocation: | Randomized |
Intervention Model: | Crossover Assignment |
Intervention Model Description: | The investigators will use a randomized crossover design. All children will receive two interventions during a single study visit. Children will be assigned to one of two research design arms using a stratified random sampling approach with child sex balanced across arm (N=110 in each group). All children will participate in the same tasks, in the same order. The only difference between research design arms is the timing of the interventions. In one arm the child will interact with the therapy dog prior to the psychosocial stress test and will interact with the stuffed toy dog prior to the behavioral tasks; the reverse is true for children in the second arm. |
Masking: | Triple (Participant, Care Provider, Investigator) |
Masking Description: | Participants will be unaware of which study arm they are assigned. Individuals performing the interventions will be blind to study condition. The investigator will be blind to study condition until data analysis. Video data will be coded by observers blind to the study condition. The primary outcomes assessor is not blind to study condition. |
Primary Purpose: | Basic Science |
Official Title: | A Pilot Study of the Effects of Interactions With Therapy Dogs on Child Stress Responsivity |
Actual Study Start Date : | June 15, 2019 |
Estimated Primary Completion Date : | April 30, 2021 |
Estimated Study Completion Date : | April 30, 2021 |
Arm | Intervention/treatment |
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Experimental: Arm 1
In this condition, children will interact with the therapy dog prior to the psychosocial stress task and with the stuffed toy dog prior to the prosocial behavior tests.
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Behavioral: Therapy Dog
Children will undergo a 5 minute unstructured session with either a certified therapy dog or with a dog who is trained and certified for animal-assisted interventions and/or animal-assisted activities. Children will be allowed to talk to, pet, and play with the therapy dog during the interaction. Behavioral: Stuffed Toy Dog Children will undergo a 5 minute unstructured session with a stuffed toy dog. Children will be allowed to talk to, pet, and play with the stuffed toy dog during the interaction. |
Experimental: Arm 2
In this condition, children will interact with the stuffed toy prior to the psychosocial stress task collection and with the therapy dog prior to the prosocial behavior tests.
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Behavioral: Therapy Dog
Children will undergo a 5 minute unstructured session with either a certified therapy dog or with a dog who is trained and certified for animal-assisted interventions and/or animal-assisted activities. Children will be allowed to talk to, pet, and play with the therapy dog during the interaction. Behavioral: Stuffed Toy Dog Children will undergo a 5 minute unstructured session with a stuffed toy dog. Children will be allowed to talk to, pet, and play with the stuffed toy dog during the interaction. |
- Mean level and Change in Salivary cortisol [ Time Frame: Measured at baseline and over a 45 minute period before and after the psychosocial stress test ]Salivary cortisol will be collected 7 times during the study visit.
- Mean level Prosocial behavior assessed with the Zurich prosocial game [ Time Frame: Assessed after the 2nd intervention. ]During the study visit prosocial behavior is assessed through total number of helping behaviors recorded during the Zurich prosocial game.
- Mean level Behavioral carefulness assessed with the children's game, Operation [ Time Frame: Assessed after the 2nd intervention. ]During the study visit, participants will play the game Operation. Behavioral carefulness metrics include number of errors and total time to complete the task.
- Mean level and Change in Psychological Well Being assessed by the Positive and Negative Affect Scale for Children (PANAS-C) [ Time Frame: Measured at the beginning of the study visit and before and after each intervention. ]The PANAS-C will be administered repeatedly during the study visit.
- Mean level and Change in galvanic skin response measured with the E4 wristband [ Time Frame: Assessed during both interventions and during the psychosocial stress test. ]Participants will wear an E4 wristband during the study visit that records continuous physiological markers of stress.
- Mean level and Change in heart rate measured with the E4 wristband [ Time Frame: Assessed during both interventions and during the psychosocial stress test. ]Participants will wear an E4 wristband during the study visit that records continuous physiological markers of stress.
- Mean Level and Change in Salivary Oxytocin (pending additional funds) [ Time Frame: Assessed immediately before and after each intervention. ]Salivary oxytocin will be measured repeatedly during the study visit.

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Ages Eligible for Study: | 8 Years to 12 Years (Child) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- Children between the ages of 8-12 years old
Exclusion Criteria:
- Limited comprehension of English
- Severe neurological, medical, or psychiatric illnesses (e.g., schizophrenia, psychosis)
- Severe asthma or animal allergies
- Animal phobias
- Use of medications that affect cortisol

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03949569
Contact: Kristen C Jacobson, PhD | (773)834-0265 | kjacobso@bsd.uchicago.edu | |
Contact: Lauren N Pasetes, BA | (773)834-7128 | lpasetes@yoda.bsd.uchicago.edu |
United States, Illinois | |
University of Chicago Medical Center | Recruiting |
Chicago, Illinois, United States, 60637 | |
Contact: Lauren N Pasetes, BA 773-834-7128 ext 4-7128 lpasetes@yoda.bsd.uchicago.edu | |
Contact: Rena Redic, PhD 773-834-2244 ext 4-2244 rredic@yoda.bsd.uchicago.edu | |
Principal Investigator: Kristen Jacobson, PhD |
Principal Investigator: | Kristen C Jacobson, PhD | University of Chicago |
Responsible Party: | Kristen Jacobson, PI, Associate Professor of Psychiatry & Behavioral Neuroscience, University of Chicago |
ClinicalTrials.gov Identifier: | NCT03949569 |
Other Study ID Numbers: |
IRB18-0472 R21HD094956 ( U.S. NIH Grant/Contract ) |
First Posted: | May 14, 2019 Key Record Dates |
Last Update Posted: | September 25, 2019 |
Last Verified: | September 2019 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | All IPD underlying research publications |
Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) Analytic Code |
Time Frame: | Data will be available beginning 6 months after publication and will be available for up to 5 years post-publication. |
Access Criteria: | The PI will evaluate written requests for IPD sharing. All requests must be made from individuals with legitimate research questions and must be compliant with IRB regulations. |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Children Human-Animal Interaction Stress Cortisol |
Fractures, Stress Fractures, Bone Wounds and Injuries |