I have two large dogs that are heavy chewers. They are usually able to destory flimsy dog toys in a matter of minutes, which can be dangerous (if they ingest the material). My favorite toys for them are Kong and Nylabone - both brands carry products for dog toys that are virtually indestructible. Both are kind of expensive, but the price is worth it in the long run because the dog will use it for a long time. My dogs especially love to gnaw on Nylabones - they stay occupied for quite awhile working on them.