Midnite is going through them pretty quick. He has some powerful jaws. He is and we are guessing about a year and he acts like he's still teething. Does this kind of heavy duty chewing ever end? I was outside talking to a neighbor and he was getting excited and he bit the corner of the couch, I'm not kidding when I say one bite and he made a good sized tear right down to the wood. I don't foresee this dog being out of the crate for a long long long time.