Harley destroyed an Extreme Kong!

I just went in to let Harley out and saw that he had torn apart one of the large Extreme Kongs (the black ones). I don't even know what to think about that. I have 3 more (2 large and 1 xlarge) but now I'll have to watch him with those too. The only thing I can put in his kennel without worrying is a bison bone. He seems really anxious right now. I'm going to leave him in his kennel and bring treats in to him every 10 minutes or so. If I let him out he'll just go after me. Sometimes it's very frustrating.