I'm open for suggestions here. Devon has developed a nasty litter box habit that I'm trying to break. He finally threw up today because he ate so much cat . I've tried scolding him, and even yelling at him when I caught him going into the place where the cat's litter box is, but so far it's just made him more sneaky about it (if he sees me watching him head down the hall toward the half bath where the litter box is he stops and turns around). Unfortunately I don't think I could move the cat's litter box anyplace that's completely out of reach for Devon as he can now go up and down stairs, and so the second floor or basement aren't going to be of help. While I could put the litter box up on a counter or something, I would think that a guest coming in the house would be unlikely to stay very long if they saw a litter box on the counter I need some way to make Devon want to avoid it, but wouldn't keep the cat from using it. The only thing left that I can think of off hand, which would be kind of drastic and possibly expensive, would be to buy some invisible fence stuff and try to adapt it for indoor use to make the room with the litter box in it off limits to him.