This method of breaking up a fight works on @Dirty D as well. Mom said she has used it several times when he tries to be the alpha fuck toy.
If some dog grabs my dog by the neck like that, it's going to have its back legs stomped on and broken. If you can't control your dog, I'll control it for you, and you won't like how I do it.
I am very much a dog lover, but you need to keep you dog under control.