Upper Extremity Function Before and After Hippotherapy in Children With Autism Spectrum Disorder and/or Cerebral Palsy

The goal of this feasibility trial is to learn if hippotherapy and physical therapy in the equine environment can be used to improve upper extremity function in children with cerebral palsy or autism spectrum disorder who present with motor delay or impairment in the upper extremities. The main questions it aims to answer are: Can the upper extremity-focused treatment using hippotherapy and the equine environment be delivered to fidelity? Is the treatment acceptable to participants and therapists? Is the randomized-controlled trial protocol feasible to scale to a larger study, including recruitment and retention rates and suitability of selected outcome measures? If there is a comparison group: Researchers will compare participants receiving treatment to a waitlist control to see if participants are retained in the control group and if differences are detected between the control and treatment groups on selected outcome measures.