Baxter is just over eight months old and has been potty trained for several months (since he was probably 4 months or so). I can't remember the last time he had an accident until...this past week. He's had four - twice in his crate, and twice in the house. Once was right next to the front door. Once was in the middle of the night and I'm pretty sure he did it in his sleep - I woke up from the smell and his underside was soaked. He goes out at about every four hours - I come home during lunch on the days he doesn't go to doggy day care. I'm very frustrated and not sure what is going on. Any ideas? Could he have a UTI?