If you can't isolate him for a time out, remove yourself (and everyone in the family needs to be consistent with this - every person, every time).
When he learns that teeth on skin = immediate end of fun, he will get the message.
When he learns that teeth on skin = immediate end of fun, he will get the message.
That's the flat earth theory of dog training - thoroughly disproven and discredited, but old fashioned trainers still insist on referring to it. Please disregard anything you have told about dominance; until he steals money from your wallet and takes your car without asking, I promise you dominance is not what you are seeing.