We've had this cat for about a year, adopted him, he's probably about 2 years old. Up until 2 or 3 weeks ago he's been absolutely perfect with the litter box. Now he's peeing everywhere else. It started off being once every few days, today he's peed twice in the house. I don't think it's marking...when he goes it's a full bladder worth. We thought maybe it was a UTI, though he shows no pain when he goes. He didn't have enough urine in his bladder today for the vet to check, but she gave us antibiotics and we started them. She said it would take a couple days to take effect, if it was a UTI. She felt his kidneys and they felt fine. She didn't feel a stone or anything. Please someone tell me this must be a UTI and this'll stop! If it isn't a UTI, what else could it be? We've had some changes, brought a dog in a few months ago (but he LOVES the dog, sleeps with him), have been trying to litter box train them (though we're taking a break it's not working so well) but he never had a problem peeing in the toilet, he took to that very quickly. We so worried and upset about it. We can't deal with this if it's a behavioral thing (something unfixable). He would have to become an outdoor kitty and I can't bear to do that