Give him a quick shot of dog spray when you catch him... Should change the mindset pretty quick.
For real, though, sounds like he has too much energy... I know, I know, everyone always knows better, but from my experience, my dog was a chewer, and once I started running him, or taking him swimming and fetching, the chewing stopped.
I don't have any advice for a deterrent, although maybe spraying some of that dog spray on the item chewed will deter him.. But he may just find something new to chew.
J
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