What do you guys think about lisensing your dogs?

On one hand, it's good because it helps find your dog if it's lost, and the city knows approximatley how many dogs are in the area and they can provide parks and whatnot according to the amount of dogs. You also get fined if they find that you don't have a lisense.

But then, the city knows exactly what breed your dog is. They could seriously make your life Hell if you own a "dangerous" breed. They know exactly how many dogs you own, which can be a bad thing (in my city, you are only allowed to have two dogs unless you live on an acerage -- even if it's two chihuahuas).

What do you think?