If i hear of someone getting bitten or attacked by a dog i would not blame the dog at all, i would blame the owners of the dog because a mean dog is because of a mean owner.
My dads friend has a dog named Mel (yes thats why my username is MeL) hes a very nice dog and I watch him alot. One day my dads friend saw him in front of his yard and went over and he had no collar or anything so he took him in and got shots and took him as a pet. We noticed he had some teeth missing and when a thunderstorm or fireworks went off he would book it outa there so we figured he was abused and ran away (if only i knew who did it). Me and Mel where in the backyard once and i took out my golf clubs to hit a few shots and when i even walked near him with them he got really scared and i felt bad and put them away. My guess was that the original owner tryed to make Mel a fighting dog because Mel is a pitbull but it didnt work out so they let him loose of he ran off. These kinda things just make me mad.