The longest they have gone w/out being let out is 5 -6 hrs and had a few accidents (which I can live with) The neighbor that was helping has moved and she was the only one I really trusted. I've got kong's for them but I've never thought of putting pnut butter inside or freezing it. I'll certainly give it a try! They'll wear themselves out licking it. Guess I am the one that has the problem with it...putting humanistic thoughts into their wee lil' heads...Ceasar would get me for that huh?

Thanks for the suggestions!