He's too young to be territorial and we don't have any other animals. We cleaned the mattress and threw out the sheets but he did it again. He uses the litterbox just fine and he's very well adjusted to us. The super weird part though is that he only pees on Dave's side of the bed; but out of the two of us Dave is obviously his favorite. He doesn't have any health issues although he did get treated for a respiratory infection when we first got him a couple of months ago and he doesn't have any symptoms for anything like a UTI. I'm so confused. And tired of buying new sheets. We keep him locked out of the bedroom at night because I have no idea what to do.