I had a pitbull experience last sunday. My 3 kids were playing in the backyard when a stray pitbull jumped the fence and entered said yard. My kids freaked and started yelling at it to go away, at which time my dog, which was inside the house, jumped through the screen door ($130 repair) and attacked and drove off the stray pitbull, then went to each child to comfort them and made sure they were OK, she is very motherly to my kids since she has watched them grow. I then grabbed a shotgun and went to dispatch the stray before it could hurt somebody. My kids begged me not to shoot it, so I told them to grab me some dog biscuits and I used that to befriend the stray and then tied it up until animal control came to collect it.
My dog is very heroic and has saved my wife from a rattlesnake bite, and took a bite in the neck while killing the snake, but she healed up just fine. She also saved my ass from a stray Rott that wanted a taste of my ass while I was jogging. Great dog, the whole family loves her beyond words and it's obvious that the dog will do anything for us. My dog is a pitbull by the way.