Veterinarians use a variety of controlled substances for their animal patients – in the form of pain medications, anesthetics, anabolic steroids, euthanasia solutions and more. This raises professional and legal considerations as the Controlled Substances Act requires strict adherence to the regulations related to the ordering, storing, dispensing and recording of controlled substances.
Source: https://titangroupdea.weebly.com/blog/regulations-for-controlled-substances-in-a-veterinary-setting