Summary Radiation therapy is becoming increasingly more available and in demand for small animal veterinary cases. Although there is a demand for radiation therapy in large animal cases, there are certain limitations of external beam radiation therapy for horses that restrict treatment options. Currently, there are only five veterinary teaching hospitals in the United States where external beam radiation therapy can be performed on horses and other large animals. This is in contrast to the roughly 80 facilities, both academic and private, available for small animals. The goal of this commentary is to give a brief overview of external beam radiation therapy and highlight the steps involved, and the technical difficulties faced, while treating horses with external beam radiation therapy.
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