Brutus will sit at the back door and wait for us to let him out. If it's an emergency he will bark or grumble. Frankie is a little confused as he will scratch at the front door when he has to go even though he is never brought through that door. He know he goes out the back door but still scratches on the front. I will watch Brutus though still at 15mos old if he is playing vigorously he has to go out right after.