When my grandmother died, I adopted her geriatric cat. We had three other cats at the time, but he fit right in with them. My hubby had built what we called "the cat room" and it had a huge enclosed area (width of room) that contained four litterboxes. I opened the side of the enclosure to clean the boxes. Well, I started noticing someone was peeing and pooping outside of the box, right at the entrance. I had no idea which one it was until my baby was born. While I was in the hospital, DH brought home one of the babies little shirts for the cats to smell. Well, Dusty (Mema's cat) sniffed it and then peed on the couch! Right in front of DH. He was furious. He took the cat to the vet and told them to board him until we could figure out what to do. I had them do a urinalysis and he had diabetes! So have them check for something like that, not just a UTI.