yep there actually called "american staffordshire terrior" i have a breeder that has a female tigerstripe bengal that is a show dogand has won granchamp three years in a row now and they wanna breed with my dog...all have papers...i just never had the time to drive the three hours to introduce the dogs..and if i did i would have to muzzle for these dogs are trained and not dog friendly.....however...this one time someone i knew had a weiner mix lab and pit....small little thing and the dogs actually let her into the house and played with them all the time but have tried to introduce new dogs and that was a no go...there was a german shep mix boxer and lets just say that didnt end up pretty..i had to get in the middle of it and break it up and i ended up getting bit by my male...he didnt bite so to speak me he was pushing with his back legs as i was pulling on the collar and i pushed the other male dog away at the same time put my arm in the "no fly zone" and he connected on my arm but let go right away....even a trained dog like you said can have a bad day or the handler is in the wrong place at the wrong time....i ended up having to go to the hospital...im just thankful he let go...it could have been real bad if he locked his jaw on my arm with the other dog right there...