Leo is housetrained. Apparently, though, he's only trained in the kitchen and family room. It's true that those are the two rooms where we spend most of our time, and we very rarely even allow him in the living room since we're not in there. It's a formal front living room, and it really only gets used when guests come. Anyway, a couple of times in the past couple of weeks, he has peed in there in a rare moment before we call him back when he goes in there, I guess. It's not that he doesn't know where to go out - when he wants out in the back yard, he just sits by the big sliding glass door and stares at us until someone opens it for him. But I guess he hasn't extended that training to the living room - we don't spend much time there, so it's okay to pee there? What do we do?