CHeck out these balls for him. They're not indestructible if the dog really tries but they last. The medium one is the same size and bounce as a tennisball. They're Otto's favorites, he has one that's about 5 years old.
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.