My younger GSD is incredibly destructive and I have yet to come across a toy that he can't destroy. The ultra king kong (black) is the best I can do. Even with that, after he chews on it for 15 minutes, he starts getting pieces off. It used to be that he would spit all of them out. However, now he tends to swallow some. They're pretty small pieces (no bigger than the size of a nickel around). If I see him take a bigger chunk off, I usually force his mouth open and get it out....but it's not so practical for the tinier pieces, as he gets them down before I can get them out.
So how concerned should I be? I'd rather not leave him without anything to chew/play with when he's out in the yard. He'll end up going after sticks (and eating some smaller pieces too) if he doesn't have a kong. But I also would hate to have anything bad happen due to the kong pieces.
So how concerned should I be? I'd rather not leave him without anything to chew/play with when he's out in the yard. He'll end up going after sticks (and eating some smaller pieces too) if he doesn't have a kong. But I also would hate to have anything bad happen due to the kong pieces.