He is about 50 lbs now! When he was a small puppy we had to let him out at night, at least twice but only for the first week that he was with us. After he was used to us and the house, he trained himself to sleep throughout the night. I think he was the size of your dogs now back then. I removed the water bowl about two hours before bed time, so it helped training him from wanting to go out at night. Now, he drinks whenever he wants.