My dog is little, but he chews like a Rottweiler. Cow hooves, frozen raw beef or buffalo bones, antlers, and surprisingly milk bone dental bones. The raw bones you have to be careful not to leave out since they can grow bacteria unless you clean them after the dog gets all the tasty bits. Cooking the bones prevents bacteria, but hardcore chewers will be able to break the bones and could hurt themselves. I don't have extra, but could send some if you can't find them.