my reply is along Natiks, you just dont hear about people being ' savaged by a teacup yorkie' because it will not do as much damage as a larger dog, but thats the only difference, not the breed itself. i was bit by a yorkie, it hasn't made me scared of them or want all of them to be muzzled. it is down to ownership. so many peeps out will pull their little dogs away from my two when mine have gone up to say hello, causing that dog to become fearful as they are projecting their fear onto their dog, and when that dog starts barking, my two back off, they know what the dog is saying, but a dog who hasn't been taught what that means through socialisation or a person who ignores the warning signs, the dog may well bite.