To add to the dangerous dog discussion, we had a family dog for over ten years. One morning he suddenly growled at my father un provoked, a week later he snapped at my mother. That was it, dog was gone. My siblings and I were devestated, called them the dog murderer. But they were absolutely right. So so sad, dog ownership should be regulated for aggressive breeds.
I assume it wasn't a rescue dog from a dog's home etc, I'm sure they don't allow adoptions of dogs with young children in the household?