Good Luck. My 100 lb lab is an inside dog, and he finally chewed up enough stuff that I put a muzzle on him every time I left the house. After periodically wearing it for about 4-6 mo., he doen't need it anymore. He won't chew on ANYTHING. The easiest way to keep them from chewing is to give them plenty to play with and chew on... also try pigs ears. And be sure to catch him in the act and punish him for it a few times.

PS. I don't recommend a kennel run...those are for people like DOC E that obviously don't understand that if we wanted our dogs confined, we would have confined them instead of asking for alternate advice.