Awww, poor woofie...
I am a dog lover, can't imagine life without having a dog, BUT, I understand completely vegi. Given your feelings about dogs, your home is not a good match. The dog of course senses this and is acting out. it's not the dogs fault, he doesn't know any better but biting your Son is not acceptable, but again the dog doesn't know any better. He definitely needs some intensive training, but by someone else from a home that wants a dog and the challenges that come with an aggressive, untrained woofie.