I'd say you've been pretty lucky. So far! I've had two friends attacked by pit bulls. See my #23 (I think that's the right number) Again, what were these dogs bred to do?
I guess I'll answer my own question, since no one else seems to want to.
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In 1835 the British Parliament outlawed bull baiting, a sadistic gambling game in which bulldogs were used to attack and harass bulls brought to market with the dubious intention of tenderizing the meat. The dog would assault the bull, avoid the stomping hooves and slashing horns, grab a tender nose or ear, and hang on until the bull collapsed. Commoners and royalty alike sought diversion from the violence and diseases of their day by attending these bloody spectacles until a public outcry forced Parliament to take a stand.
Once bull baiting was banned, dog breeders who appreciated the fierceness, courage, and tenacity of the bull dogs turned their attentions to breeding dogs for dog fighting. They began with the bull dog, mixed in some terrier blood, and produced the Bull and Terrier, a dog that met all of their expectations. The Bull and Terrier was bred for aggression to other dogs, unrelenting bravery, a high pain threshold, a willingness to fight to the end, and an affection for people."
As an aside, when I informed my insurance man that I had a large dog (Briard), he told me not to tell him that!
I don't own pitbulls, I own a little curly tailed 120 lb. Anatolian Shepherd (known as a Kangal) and momma keeps the 140lb Rottweiler with her in the city. Both breeds can be banned if good socialists have their way....that would be YOU. And I live in the sticks now, the city has too many morons that can't understand why a dog might bark at them....