It's just him ! By 'outside' you don't mean out in the street?Leave him out there, he'll come in to sleep( and to eat, I expect). Of course, the definition of 'door' is 'something a dog always wants to be on the other side of', but he hasn't reached that stage yet. Be thankful you haven't got two of mine; let them out in the evening and they disappear across the fields to the woods, to go rabbiting, and may not reappear until the morning ! I have got used to that; they are 11 now. Once back,they may bark for me, the housekeeper, to let them in, but then, they may not; it's their decision.