A sure-fire cure to get your little pup to stop chewing the furniture: dab the corners with a bit of dish soap.
I tried all kinds of things. I used that Bitter Apple spray, but my dog thought that meant she was SUPPOSED to eat it. The only thing that kept her from chewing my furniture was to put a bit of dish soap on all the ends of things.
And after a day or two it's not sticky anymore, and it won't discolor your wood and just wipes right off if you need to.
It worked fast. She hasn't chewed on my furniture (or baseboards!) since.
Truth serves only a world that lives by it.