taken from; http://www.healthypet.com/library_view.aspx?ID=16 The simple facts are these breeds are overly strong. Especially in the jaw area, and when they do attack, they do much more damage, would you rather be pinched by a pair of tweezers, or the jaws of life?There are potentially millions of other dog bites that are NOT reported because they don't do much damage and people move on. Hell my woman gets bite by a damn tacobell dog EVERY time she goes to her grand mothers. EVERY TIME!! you want to talk about overly ferocious little bastards those are them! BUT they're tiny, and don't do any damage other than break the skin so they go mainly unaccounted for. addition; The larger the dog, the duller the teeth are. small dogs have very sharp teeth BECAUSE they don't have much jaw strength, large dogs have very dull teeth because they don't need them, they have the force to push them through just about anything, this also does more damage as they are pushed through flesh because they aren't as sharp. Hell my dogs canine teeth had flat spots on the top that were the size of a #2 pencil eraser. I'd look at them and think, those don't look very useful. Then I'd look at the jaw muscles and remember, oh yeah, there's a good reason they're not very sharp, they don't need to be.