How do you stop that biting the neck behavior in a pit bull/lab puppy?

Every dog and breed I have ever owned has done this. You just need to monitor the the playing more and stop it when it happens they will learn.

Teach the dog general bite inhibition. Scream “no” when he bites YOU. I have a Dachshund mix and a pit bull too. I taught my pit bull bite inhibition to keep him from mouthing/biting me, but it also happened to make him gentler with the Dachshund. He is one yr. and she is two yrs. old. Sometimes he starts playing too rough but, I can say the word “ow” and he stops biting. In fact, she usually bites him harder than he bites her because he’s conditioned not to. She can go absolutely berserk at him and he puts up with it. (Nevertheless, I crate the dogs when I’m not home and I recommend that too.)
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“…The idea of using mother dog’s natural training techniques isn’t new. Respected trainers like Carol Lea Benjamin have been using them for years. To understand these methods, let’s take a look at a typical mother dog disciplining her brood. We’ll use my Heather (Chow) and her four rowdy puppies as an example.

When a playful puppy bites Heather hard enough to hurt, she squeals in shocked indignation. The puppy, surprised at her reaction, usually hesitates a moment, unsure of himself, then tries to bite again. Heather yelps even louder this time and whirls on the puppy, growling, showing her teeth and scowling at him fiercely. Then she turns her back on him and storms away, completely ignoring him and any further attempts to get her to play. A smart puppy picks up her clear message quickly: “if you can’t play nice, I won’t play with you at all!”

If the puppy persists or doesn’t take the hint, Heather doesn’t fool around. With a menacing growl and using her teeth, she grabs him by the scruff of his neck and gives him a shake. If he sasses back, she gives him another little shake, tougher this time. She doesn’t let go of the pup till he’s acknowledged her authority (in dog language) by relaxing his body, laying his ears back and keeping still for a moment. Heather disciplines especially obnoxious puppies by knocking them over with her paw and pinning them to the ground, growling angrily and pinching them with her teeth. The puppies shriek but they’re not really hurt. She doesn’t let them up again untill they relax and lie still. After the correction, the puppy shakes his fur back into place and goes off in search of a playmate with a better sense of humor.

We don’t have to growl at our puppies or shake them with our teeth, but we can modify Heather’s technique for ourselves. The next time your puppy bites you, scream “OW!” in a high-pitched voice. Exaggerate a little. Then refuse to play with him or pay attention to him for a few minutes. If he doesn’t get the message, give him a little scruff shake and scold him in a low-toned, threatening voice. You can exaggerate a little on that, too! Sound meaner than you really are. For puppies that just won’t quit or seem to get wilder with every correction, flip them over on their backs, scold them in that same low, scary voice (growling) and gently but firmly, hold them in that position until they stop struggling.

We sometimes give puppies the wrong message about biting by some of the games we play with them. Wrestling and tug of war can encourage a puppy to bite and make it hard for him to distinguish when it’s okay to use his teeth and when it’s not. To make it easier for your puppy to learn good manners, it’s a good idea to avoid these games…

yeah the same as above, treat it like a kid, if it is naughty then take away what it likes to do for a while or give him sometime out to calm down and he will soon learn! XD gud luk

Why? That’s how dogs play. All dogs do that sort of thing. As long as he’s not hurting the other dog, it’s not a problem. We have 4 dogs and they all like to grab necks and ears when they wrestle.

thats how puppies play, and thats how they learn not to bite each other. When a puppy bites too hard, the other pup/dog will yelp that says ” Too Hard!” and, they learn from that. You should consider finding a dog park in the area, or someone with a puppy about his size and age, and letting them play. Less worry that one will be hurt.