I have a bell on the door, but he just likes to play with it. The other issue is that he still won't go down stairs, so he can't actually get to the door when he is upstairs, so he usually just goes to the top of the stairway and then I take that as him needing to go out. If he's downstairs he will go up the stairs to get to the door and I take him out then as well, otherwise I just bring him out if it's been around 1.5-2 hrs. and he's not sleeping. I'm not complaining because 1 accident every couple weeks isn't a huge bother and he sleeps through the night most of the time, just wonderin