Depends. RE dogs from Dave Wilson, that many call "the originals" were Amstaff/APBT mixes selecting overdone dogs. (even did DNA testing on a few to prove parents.) Gotti has mixed, Ghangis Khan has mixed, looks like Neapolitan(I wouldn't consider them a legit line). Most bullies aren't Mastiff, Frenchie, etc. You're going to find the frenchie, EB mixed dogs in the "exotic" bullies like Mr.Miagi (who, for the record was kicked out of the ABKC last time I checked and people still pay a crap ton.) The Mastiff mixes you'll see more in like Camelot, Whopper, Eddington, which aren't Ambully lines. Well some might've got mixed in, but they're not considered one.