I work at a vet and I cannot count how many times a chihuahua or a Shih-tzu tried to bite me. People tend to laugh at those just because they are small dogs, but they are just as bad as any untrained dog. Make them a 100lbs and we will see which breed is dangerous.
People treat them like children rather than dogs and most of them just because really spoiled and dominant and out of control.
A breed doesn't make a dog, a person does. Unfortunately idiots give those dogs a bad reputation.
I love pit and rotts, they are just the best.