Well that looks like a cool dog. Some friends of ours have a dog like that and all I can say is the need loads of room to run and burn up that energy. What our frind did was get a tenis ball and bat and they would hit the ball as far as they could and let it run. These dogs need more then a walk. So maybe he is not having enough running to stop it from chewing everything.
Either way I hope it turns out good for jack.
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