This is the only ball I have found that will last more than 10 min. before my Wolfhound mix can shred it! It now takes her several days to several weeks (depending on how agressively she chews) to make a dent in it. The only design flaw in this ball is the "disc" at each end of the ball - that is the first part to go. Even though she eventually gets the best of it I have bought several because it is the best one I have found so far. Kudos to West Paw Design - they sent me a replacement ball just as the guarantee promised!!!Thanks so much.