Chewing: spray the things you do not want him to chew with bitter apple and when he goes to chew say psstt to stop him (he will begin to associate the taste and sound together, so eventually you will only need to say psstt) and redirect him with a desirable chew toy and praise him when he takes it; crate him when you cannot monitor him, include desirable chew toys like a bully stick or kong filled with a tasty treat. He may be in a teething phase, which causes them to be chewers of all.