There's a useful article on destructive chewing at www.canine.org/chewing.html
It gives many ideas for managing chewing & includes a suggestion to put a certain bitter, but harmless product on furniture. There's also a list of useful items to give the dog & even a recipe for stuffing a hollow bone...called Puppy Cannolis. Another suggestion is to provide the dog with OK to-be-chewed items such as old sneakers.