We have a GSD that can and does destroy toys in the blink of an eye. Longs are good, but they didn't last very long. Then we found the chuckit! balls. We have the same two that we bought 4 years ago, still in excellent condition (but would never be mistaken for new) and the dogs love chasing it, sitting on the floor and chewing on it - heck, even our Yorkie can play with it due to its ridges. They're cheap enough to give a try too.
http://www.amazon.com/Whistle-Dog-Ball-Blue-Size/dp/B005N2NCNW
http://www.amazon.com/Whistle-Dog-Ball-Blue-Size/dp/B005N2NCNW