So, when an aggressive dog runs at us or our children, we are supposed to assume it doesn't really mean it and we should trust that we're actually safe? Huh? This dog was cited last year for this kind of behavior. If the anti-barking collar battery was dead, that's on the pet owner. If it is supposed to be confined in it's yard and is behind an invisible fence, how was the man to know that it would stop before it took out a chunk of him? The above story says it was used to keep bears away- I'm assuming it wasn't trained to "use it's words" to resolve the bruin problem, so the animal's aggressiveness was at some point encouraged, making it a poor choice for a city pet. It should have been re-homed in a more appropriate environment. Take responsibility for your pets! That dog does not have more value than the kids in that neighborhood, and what happens if a kid chases a ball into the dog's space? It sounds like this was only a matter of time before it hurt someone or was put down.