Farnam No Chew Bitter Taste Deterrent Horse Spray, 32-oz bottle
I tried this for my OTTB that was chewing the wood posts in the barn and fence posts. It works very well. I sprayed the chewed surfaces thoroughly and she sniffs them and then doesn't bite the wood. A spraying lasts several days. It works well enough that I ordered 3 more after trying it. And in case you are wondering, she has free choice hay at all times.
This product is for horses. Works great. Not dogs or puppies.
It didn’t work at all. My puppy immediately wanted to eat the sprayed area even more than before.