I have a 100 pound pit bull, a toy crazy shepherd mix, a doberman, and a group of little dogs. I've had one of these balls for 2 weeks, and though its looking a little rough around the edges its still intact. The pit bull is one of those dogs who's joy lies in destroying toys and he has chewed on this for hours, without being able to destroy it. They love it. I am going to order more as soon as I can, this is so much better than tennis balls that last only a day or two unless the pit gets to them, in which case they pop as soon he puts them in his mouth. This is the only ball I am ever getting again for the bigger dogs.