Aww Bazza looks so happy with his ball. Our guys are ball crazy too, but like Bazza they can't have any tennis balls, because they first eat the fuzz off the ball, and then they chew up the ball and eat the pieces, they also can't have any soft balls for the same reason. The only balls I've been buying for them are the Kong Balls and the JW? I think that's what they're called. Both of these brands are really hard , and so far have been bully chew proof. My guys also like the Jolly Ball made by Kong, it's a huge ball with a handle on top.