I have a 9 month old male Boxer named Cassius. Over the last few weeks he has peed on my family room couch while we are making dinner. The odd thing is, he is not allowed on this particular couch ever, and he does this roughly 10 minutes after going to the bathroom outside. He doesn't pee anywhere else in the house and is completley trained otherwise. I first thought he was marking his territory or something, but he is neutered so this doesn't make any sense. There is no evidence of any infection(UTI, etc..) so I am at a loss here. Does anyone have any advice, or have gone through a similar situation?