My mom is a physical therapist and her coworker (let's call her Meagan) was attacked by her own pit. Meagan and her husband got this pit as a puppy, and raised it great. They would never hit her or use any physical discipline against her when training. They never had any other animals in the house, but had a small kid, under 10. Their pit never showed signs of aggression. One day, Megan was lounging in their pool; one of those that has an inflated ring on top and is an above ground pool. Their pit had her paws on the inflatable ring and was trying to jump in. Megan tried telling her to get down, and when that didn't work, tried shooing her away with her hand. Their pit grabbed her arm, wouldn't let go, and shook. Megan couldn't get her arm back, was screaming for help and their pit kept attacking. Finally her husband was able to get to her and get the pit off. Megan almost lost her arm, had to go through a ton of PT to regain movement, and will have permanent nerve and muscle damage. Megan had no idea why her dog snapped and attacked. She showed no signs of aggression beforehand, and was raised in a loving and caring home. Megan told my mom that she would've advocated for pits beforehand, but is understandably scared of them now. Thankfully the dog was put down and their kid was never harmed.