I have bought and used the bitter apple spray i THINK it has worked. I used to leav my dog out of her cage when I was at work and she would do it then, then I just started getting fed up so I put her in her cage when I'm gone. So I think it's mostly me just putting her up and away from things to chew on. She chews on my baseboards, in the middle of doors, the bottom of my couch...weird. But the bitter apple spray should work and i've heard that deoderant works too.
