The only treat you can re-treat. Engineered for aggressive chewers in mind. Tiny flavor cells are molded into both sides of the Flavorit chew bone so you can fill it with peanut butter, cheese, cream cheese, or any other spread your dog prefers. The tiny flavor cells hold just enough spread to entice your dog to chew, but not so much that they're getting too much of a fatty thing. You can even add a different spread on each side to really make things interesting! http://petqwerks.com/dog-chew-toys/