It sounds mean but, this is what I do.. and it works like a muthafucka.
My pitt was really bad up until about 8mo old.
This bitch chewed anything and everything even the wood cross-members
on my balcony railing.
I would eyeball her, wait for her to fuck with something..
Then BAM, crack one of these babies in half and schwab it on her nose.
Habanero peppers can be found at most major grocery stores or any latino market.
They run about 30cents each.
But if your too much of a wuss to put your dog through that.. (lasts only a couple minutes)
Then buy that deterent spray at petco for 20 bucks..
My bitch straightened out real quick on the peppers though.