Cannabis for dogs – is it safe? With people using medical cannabis to help them with different ailments and pain, they are using it to treat their dogs. Medical cannabis for dogs is becoming a booming industry. But there is little research on the effects of medical cannabis on our beloved pets. While there is anecdotal evidence it helps dogs with seizures, anxiety and cancer, there are less than 60 studies about its effects on dogs. And most of these studies are about the toxicity of cannabis for pets.