i went to wikipedia and there are listings for american pit bull terrier, american staffordshire terrier, and american bulldog. they all have slightly different looks about them, but at the bottom of the page for the american bulldog, it said that they are all closely related. so...i guess that is my answer

I'd rather play safe than sorry, so I will just not accept any of those breeds. I just hate turning people away because of their pets, but it is my company I have to look out for, and insurance just won't allow it