My dog loves these! We call them �eternal� kongs because she can�t actually get the treat out (we make them that way, you can make it easy with smaller treats). Because of this system, after several months the middle bit starts to chip away from all the teeth marks and biting. I buy a new one about once a year as the new one wears out. In a perfect world, it would last forever, but if your dog is a tough chewer like mine, there will be wear. Still, would recommend!