Keva is 2 and she still loves chewing wood. Luckily she has left the deck alone, my dad would be really angry about that especially since we just re-did it. But the trees, forget it. She and Skya eat them together. I think she would choose chewing a stick over a rawhide sometimes. We have a ton of toys outside too. Luckily the tree they have chosen to "eat" is already dead. Really I think you just won't be able to leave him unsupervised outside, even if he has stuff inside to chew the temptation is there. Well that is if he's like Keva (hope he's not and he outgrows it or realizes that wood isn't as fun to chew as rawhide, etc.). She's also chewed up the fence trying to get to the boxer that lives behinds us (they want to play). Nebo has occasionally chewed on a tree branch but that's about it....he is not even close to as destructive as Keva has been, he doesn't even dig holes.