I’ve read that attacks like this by pit bulls are rare. That claim is one I’ve heard many, many times, always after a put bull kills or maims.
I goggled “mauled by” followed by “pit bull” as well as other types of dogs. Pit bulls aren’t alone in mauling people (or other animals)
But there is no doubt they are particular aggressive. Most dog breeds were selectivity bred to weed out aggressiveness.
Not so with Pitt Bulls I guess.
http://en.wikipedia.org/wiki/Pit_bull