Both of my labs were destructive chewers until around two years of age. Now don't get me wrong they still chew, but can somehow distinguish between what is allowed and what is not.
Some of you know we have a new home, and are constructing steps and walls in the basement, well all the pine board scraps somehow end up on the dog beds........ALL CHEWED UP. I mean destroyed~
But yet there are thousands of dollars of tools and stacked lumber lying around...and it is never touched. thank god! Not to mention all the kids toys, and they are untouched also. Eventually they learn what is off limits and what is okay.