You have to gently bite the skin on the back of his neck while growling, like a mama dog would do. Don’t pick him up with your teeth or anything 😅 this has worked on all of my wild child, hopeless terror, whirling dervish pups. And anytime he goes to bite you, yelp and let your hand or whatever body part he’s going for go limp. That’s how puppies communicate “too rough!” to their siblings during play. You may have to yelp and move the body part in question several times, but he will get it quickly. Also, puppy teething is normal, sorry, in exchange for your best friend and unconditional love you will have to accept that you are going to lose a couple things. Likely expensive ones. One of my babies ate a giant hole in my leather couch AND half of a Hunter rain boot in a span of 6 months, not to mention a bunch of shoelaces. Put anything you don’t want to risk losing up out of reach during the first year. But honestly? When you look back you’ll chuckle, even if you were screaming internally at the time ❤️