Tinker (RB) was severly injured by a pit. Of course TINKER attacked the pit and was trying to kill HIM. My fault, he got off the leash and the pit was leashed with his (too young, too small) owner trying to control him. I had NO control over my dog. MY FAULT. Any dog can be dangerous, some just have more muscle & power.
Some chihuahuas (the above mentioned Tinker) would be put down if they had that kind of strength. They would be branded 'killers" and banned.
I know a poodle that would have to be destroyed if he had the muscle to maime and kill, he's quick with the pearly whites and you have to watch him, but he's a "harmless" little poodle.
I'm not saying anything bad about these dogs, just trying to make a point.
Our American Staffordshire, Zypher (RB) was VERY strong. I didn't trust myself (100 lbs at the time) to walk him alone. If he saw a cat- shoom!! Gone! ALL pet owners have to have control over their pets regardless of whether it weighs 10 lbs or 110 lbs.
I personally love the breed.