been to the vet, was told UTI, put the cat on antibiotics for 10 days, gave a dose of buprenex at the vet to releive pain. he was fine for 2 days doing his business no pain. Started back with the howling after peeing and straining to poop. Vet gave us 6 doses of buprenex to be administered 2x a day every 12 hours. started that yesterday and he has not used his litter box since. what should i do continue with the treatment or call the vet again in the morning.

