If you are an owner of a dog that belongs to a ‘dangerous breed’
category and you also have a child or a visiting small child please
take this as a warning.
Don’t leave your dog with a small child unattended under any
circumstances!!!
Only one little moment was enough for the following to
happen:
Chow.
The View from Down Here 
This is a perfect guide. I agree in your post that we should not leave small kids with the dog.