We seem to have gotten off on the wrong foot. I honestly can not tell what your position is on the dog who "put his mouth around her[child's]HEAD and just gave it one shake -- one shake only."
My take is that the dog is dangerous even if it is "one shake only." I would hope you see it that way too.
Why you won't respond, or what the "straw man" is I really don't get. It was your story.
I told a simple story. It wasn't real involved.
I made no comment on the dog's movement; if I had thought it was threatening, I would have said so. If I had thought it was threatening, there would have been a part of the story that said "and I rushed over there and beat the dog."
But I'm not LOOKING for something wrong here; kids poke dogs in the eye (or wherever) and dogs defend themselves.
Now, I have five grandchildren under five; they poke and pull my dogs and cats; when my dogs snap at them or the cats scratch them, should I put the animals to sleep?