And I am sorry to hear about the attack on your dog.
I have friends (and friends of friends) who have raised pit bulls without a problem because they were well cared for.
The method of the attack was cold blooded. I was walking my dog, when out of nowhere, a Pitbull appeared and picked him by the back of the neck with its mouth and was violently shaking him. There was no confrontation, no barking. It silently approached from the sidewalk to my right like a cold blooded killer.