Adolescents with autism spectrum disorder may experience social isolation and decreased independence secondary to communication deficits. Limited evidence suggests therapeutic riding (TR) promotes social skills, but no protocol for TR with adolescents exists. This 8-week single-subject design measured social response to alternating treatments (groundwork or peer social engagement) prior to TR. Measures included a comparison of parentreport of social competence and a comparison of real-time and videotaped observations of six specific social skills. Data were analyzed by visual inspection of the graphed data and comparison of the descriptive statistics. Peer interaction prior to TR resulted in better verbal response while groundwork prior to TR resulted in better instruction following. In a departure from common practice of combining groundwork and TR, the specific goals and objectives for the individual with ASD should dictate whether a CTRS® should use social games or groundwork prior to TR.