As happens all too often, a term or name gets picked up and mis-used to imply a generalized "profile", if you will. There are standards for the breeding of the American pit Bull Terrier or "Pit-Bull". This dog is not a "Bulldog" but in the Terrier group, nor are breeds of actual bulldogs (English Bulldog and American Bulldog) "pit-bulls", although many try to call them so. The pit-bull does have some American Bulldog breed into it but that trait was for strength and agility. The terrier was breed into the pit-bull for the trait of ferociousness.
As the media and generally "scared people" have jumped on the hate pit-bull bandwagon, they have "profiled" many breeds into the pit-bull generalization. It is even happening in the posts on this topic. For the record, I am not a big fan of "Pit-Bulls" (American Pit Bull Terrier). I would not own one. However, I do own an American Bulldog. This breed has been one of the most popular "farm" dogs for decades throughout the South. My Dad owned American Bulldogs as I was going up on a farm. And yes, properly trained, they would catch a hog (3 times their size) or a cow (15 times their size).
I experienced these generalizations about 2 years ago. My insurance company, which I have used for 30 years, dropped my homeowners coverage because they found that I owned an American Bulldog. They joined the "crazed" panic created by the media and "scardies" and assumed(ass out of "u" and "me") that it was a "Pit-Bull". Even though my agent argued and even got statements from veterinarians verifying that the American Bulldog was not a "pit-bull", I still lost my insurance. I found out later that they were even starting to do the same with german shepards, dobermans, and rotts.
Pardon the ramble but generalizations about dog breeds kind of ruffles my feathers these days.