this should seem obvious

Also, this should seem obvious, but correct your dog only when caught in the act of chewing something they shouldn’t. Otherwise, they are confused even though they may be acting contrite because they’re responding to your anger.
When you do catch your dog in the act, quickly take away the incorrect item immediately substitute it with a “squeakie” toy, rubber bone or other favorite item of theirs. And by all means, then praise him lavishly.
Here are six commonly accepted tips for curbing your dog’s enthusiasm for chewing:
1. Decide if the chewing is the result of teething, curiosity, boredom or a behavioral disorder. If in doubt, talk with your veterinarian.