I love how everyone is pointing out how terrible LF and Pinecone's advice are....when Carm gave very similar advice, just worded it more PC...Swift, extremely stern, lightening correction, and move on, upbeat, and pleasant.
For the record I agree with LF and Carm. We aren't talking about a dog breaking a down or pulling on a lead, we're talking about a dog breaking the skin of the owner. Don't know the whole story, or if it's true>>("bone crushing"...really?). Honestly, just sounds like an out of control dog, with no leadership, no guidance, no structure, and owners that are really letting emotions take the balance out of the dog's life. I think the dog will be fine with appropriate structure and balanced, clear, training.
My advice is always to seek a trainer in these situations (with this would come a LOT of obedience, appropriate outlets for drive, etc....) However, I think swift, and as Carm put it..."lightening" corrections, will need to be in the dog's future. Dog is out of control. I feel like a broken record, but these scenarios are why BSL's and prejudices exist.
I've also now seen multiple, intense, out of control dogs, be put under control...it doesn't take much in experienced hands. Like LF said...most only need one "lesson." Dog's are very black and white. It's when WE make things grey because of our emotions, that the dogs get mucked up and confused.
I am not against a correction. I would not punch a dog that is acting like this puppy is, nor hit it with a stun gun. Not when there are so many other ways to train a dog. Not when, this is happening in a situation where I can set it up.
Why not put a basket muzzle on this dog and walk it to get its exercise in, then take the muzzle off and play/work with it? The moment this dog gets crazy-aggressive, lightning fast, game over.
I'm sorry, but I can't be afraid of a six month old puppy. I certainly am not going to punch one. But I am not going to let it bite me either.
I think I am hearing that they were using e-collars and prong collars already on this puppy, and so now we have a puppy that needs a strong correction. Or needs to be outwitted.
We should be able to outwit a puppy. If we can't maybe we should go for a different kind of dog, maybe a setter.