The study uses a longitudinal, within-person design with two parallel conditions. This study involves three cohorts of youth who will participate in one of two 6-week interventions. For each cohort of youth, half of the sample will be randomly assigned to the Recovery \& Care Canine-Assisted Therapy condition, and half of the sample will be randomly assigned to an active control condition (Canine Education \& Bonding). The two conditions will run in parallel. The order of the two intervention conditions will be counterbalanced across study cohorts.

The Recovery \& Care Canine-Assisted Therapy intervention is a 1.25 hour structured curriculum that will occur weekly across a period of 6 weeks. The program will be delivered by the Canine Therapy Corps (CTCorps) offsite at the CtCorps facility. Youth will work with CTC-affiliate staff, including trained dog-handler teams, a canine behavior expert, and a clinical supervisor to engage in a series of structured activities progress throughout the intervention. Week 1 is a "meet-and-greet" session where youth are introduced to all dog-handler teams participating in the program and will be asked to select a team to work with for the following sessions. Each youth is assigned their own dog-handler team. Weeks 2 cover activities regarding dog obedience, building from mastering basic commands which the dog already knows (such as "sit," "stay'") to the introduction of "new tricks" that the dog has not yet learned. In Weeks 3, youth will continue to work on mastering the "new tricks" with their dog-handler team and will also begin dog agility training. The agility training session progress in terms of complexity of number and types of obstacles. Week 4 is for proofing all skills (obedience, trick, agility) learned in previous sessions. Week 5 continues proofing all skills and is discussion of the graduation structure and dress rehearsal, and Week 6 is a graduation ceremony where family and friends are invited to observe the progress each youth has made with their dog-handler team. In Weeks 1-5, the goals of each session are outlined at the beginning of the session and brief education is provided regarding the session goals. Weeks 2-5 also include a review of the skills/activities covered in prior weeks. At the end of sessions 1-5, youth are asked to reflect on what they did during the session, including discussion of what they did really well, what they wanted to work on further, and goals for the next session. Research staff will be present during all sessions to record fidelity measures. The Positive and Negative Affect Scale will be administered on-site by research staff at the beginning and end of each intervention session. Change in affect are primary and secondary outcome measures.

The Canine Education \& Bonding intervention is a series of 45-minute, semi-structured activities that will occur weekly across the same 6-week period as the Recovery \& Care intervention. Youth will work with the same group of CTCorps-affiliate staff involved the Recovery \& Care intervention, including the same set of dog-handler teams. These sessions will begin with education on basic aspects of dogs (e.g., different breed types, caring for dogs, etc.). Youth will then passively observe the dog-handler teams demonstrating basics of dog obedience and dog agility training that parallel that activities done in the Recovery \& Care Canine-Assisted Therapy session that same week. Following the education and passive demonstration sessions, youth will be allowed to interact freely with the dog-handler teams. A brief mood questionnaire will be administered by research staff at the beginning and end of each session. Research staff will also be present during all sessions as observers and to record fidelity measures.

Baseline and Follow-up data will be collected up to 1-month before and 1-month after the intervention programs. Data collection for all subjects enrolled will be conducted by the University of Chicago Project staff, on site in the PI's lab at the University of Chicago or virtually.