Because they can’t. In most states, veterinarians risk losing their licenses if they recommend cannabinoids for pets. That may start to change soon though. Colorado is leading the charge in this, as in so many cannabinoid-related issues. And legislation is in the works in both New York and California that would allow veterinarians to legally discuss the use of cannabis products with their clients.
It depends on your pet and the medicine being used. There have been many examples of dogs being more receptive to PurCBD than traditional medications, especially with anti-seizure, anti-inflammatory, and anti-anxiety medications. Always check with your veterinarian before starting, stopping, or adjusting the dosage of any prescription medication. Many drugs, especially anti-seizure medications, must be weaned off slowly or else deadly withdrawal symptoms can occur.