dangerous dogs?

So you know how they have a sex offenders registry where you can find a list of all the sex offenders in your neighborhood? well it turns out there is also a dangerous dog registry.

I'm wondering what qualifies as a dangerous dog. Is it a dog that has killed someone before? Maybe just wounded or disfigured someone? Dont they put those dogs to sleep?

Does any state besides Virginia have this?

The good news is that there doesn't appear to be any dangerous dogs in my neighborhood.

Update: After writting this blog I watched the sarah silverman show and she had a skit where she licked a dog's butt to see what the big deal was and why they are always doing that, and someone saw her and turned her in. So she had to go door to door in her neighborhood declaring that sexually she was a threat to thier dogs. If only they had a sex predator for dogs registry....