Murphy is now six and a half months old and has not had an accident in the house in close to 4 months. However, this past weekend we had our friends over with their dog and for some reason Murphy peed three times in the house while their dog was visiting. We thought it might be because he wanted to cover up the other dogs scent, and sort of dismissed it. Then, last night he peed twice again, and one time ON OUR BED!!!! I was standing there watching him, he started doing his digging routine our our comforter, then just peed while looking right at me. I couldn't believe it, this is not like him at all...the only other thing I can think of that could cause this problem is that he was neutered one week ago, maybe he is having some complications, or has an infection? He doesn't appear to be in any pain...any thoughts would be greatly appreciated.