small dogs should be banned... when i delivered papers those were the ones to watch for. our old dog lexx had to eat one when it attacked him and katey late one night. Lexx just smacked the thing down and let him know who's boss, but it was the little dog doing the attacking. he was off leash and his owners had just let him out and lexx was on a leash (he just stood his ground the whole time).
The worst are the chihuahuas, my friend had 3 and when i visited all they did was try to bite my knees (they had to jump 3 times their height to do that). I wanted to feed them to my cat.