Has anybody here given cannabis to their pet? [View all]

I have a cat with bladder cancer. He is getting both traditional chemotherapy and a a mixture of chinese mushrooms, amino acids and CBD. I am wondering if anyone else has experience with this. After three chemo treatments and the mixture his tumor shrunk by 75%, but he lost two pounds and has not gained it back, so his vet doesn't want to continue the chemo until he gains more weight. In the meantime, it seems that his tumor is growing back, because I found a drop of blood next to his litter box. I read that THC can be toxic to small animals, but I am wondering if any other cannabinoids besides CBD might be helpful (if available). Any info or suggestions would be greatly appreciated.