I am convinced that Medjai has built a secret staircase in my bathroom. I have had him run in there and the closet, but when I call for him, he takes about 5 minutes to come out. He didn't chew on anything or go to the bathroom.
He also finds that he has to check on me whenever I go in the bathroom. Even from my bed, he will get down and sit at the door. He is always listening intently to see if I have found this staircase and the room at the end of it.
I also think Medjai has learned to put his toys and food in there, because he comes to the family room with things I haven't seen in ages, and he can find pieces of food at all hours of the day and he only gets fed twice a day. I make sure he eats everything from his bowls, and he can't get into the food container, but he finds kibble all the time.
Do your dogs do the same?