Inclusion Criteria:  For Aim 1:  Currently enrolled for services at the VA Salt Lake City Health Care System At least one mental health service encounter within the preceding 12 months Diagnosed with PTSD by a clinician within the preceding 24 months Have a doctor release to participate in equine activities  For Aim 2:  Currently enrolled for services at the VA Salt Lake City Health Care System Have a doctor release to participate in equine activities  Exclusion Criteria:  Pregnancy Diagnoses of a psychotic spectrum illness and/or cognitive impairment Physical disability that would prevent horseback riding Weight >= 250 lbs. Potentially the severity of and psychological and/or behavioral symptoms will be considered