Dogs actually have a reason to chew. Chewing helps soothe the pain of incoming teeth for puppies and helps adult dogs maintain healthy teeth. That said, dog chewing can turn destructive, and when not properly trained, a dog can really do some damage. Bitter tasting chew deterrent can help you train your dog. You can make bitter spray for dogs at home with a few ingredients from your cupboard.
Mix lemon juice and water in a spray bottle. Dogs dislike the smell of citrus fruits like lemon. Undiluted lemon juice may damage surfaces or leave a sticky film. Try a mixture of one cup of lemon juice and one half of a cup water. Shake well before each use.
Spray vinegar on things you don't want your dog chewing. Vinegar isn't pleasant smelling or tasting to dogs. With mixture of one cup vinegar and two cups of water, you can make bitter spray for indoor use.
Sprinkle cayenne pepper on things you don't want your to chew. Cayenne pepper is irritating and unpleasant to dogs, so once they get a whiff of it they will steer clear. It will wash away, so reapply it regularly until your dog no longer expresses interest in the area you are treating.