We have a vicious dog ordinance that doesn't name any breeds specifically. If the dog bites, and bites again, it is named a vicious dog and it has be locked up in a cage with a roof on it if the owner chooses to keep it, and there are fines, restitution, etc. The dog has to be registered as a vicious dog, and something about if they move away they have to notify the city so the city can notify where they're moving or something like that. (I can't remember the specifics of that part, but I remember thinking it odd.)

Any dog can be considered vicious under this ordinance in the right circumstances.

Karen