Keep Em Busy, Keep Em Happy!
The Kong Biscuit Ball is specially designed to keep your dog active and thinking, even if it's about treats. The hollow rubber ball, with four biscuit openings, is super durable, and intended for medium to large dogs. Just fill with treats, and watch your dog solve the puzzle.
It keeps him active and entertained while he tries to get the the biscuits. says a reviewer of the Kong Biscuit Ball.