"This is the only, the ONLY thing, that my German Shepherd has not been able to chip at, rip apart or break. I have the extra large and the large ones, and they're great. If you want, sometimes I put peanut butter in them and put the dog outside with it. It keeps them occupied, and you can actually just wash these things out in the washing machine if you don't want to put them in your dishwasher.I would highly recommend this to anybody with a dog that likes to chew."