We place the two dogs outside while my fiance and I are at class or at work. Problem is they come inside when we are home and they stay in with us the rest of the night because they sleep in our room. We still give them reign of the house since we have a dog door, and would rather not have to clean up a mess in our room. So as far as we can figure out he marks the downstairs while we are sleeping then comes back upstairs as if nothing has happened. As far as the "missing work" idea is considered....Greyhounds are the laziest dogs on the planet. We take him for a walk or a bike ride and he will pretty much pass out all day long on his bed. Greyhounds are notorious as being "40 mph couch potaotes", so we don't really think it is him missing his old job.