You really gotta love em! Barney takes his bone out the dog door to bury someplace in the back yard. Weeks later I'll find this bone, alot dirtier, but the same one, buried under my pillow. Really believe there is a method to this..they seem to have to age out there for a specific time. must be the smell that tells him it's time to bring inside. Like I said, you really gotta love em!