It's been about 20 yrs, and they ranged from inside the house dogs, kennel dogs to free ranging ranch dogs. Like I said I've literally been around hundereds of them. My old roomates family raised them, there were 11 kids in their family and the family was involved heavily in youth sports and church groups. Very few of their dogs could be trusted around the entire family let alone church or youth sporting events. And it wasn't just their lines because they tried to breed the meanness out of them by bringing in new animals from across the country and Canada. I get why some people love them, because when you do find a good one they are cool dogs that are very hard working. Personally, I've only seen about 6 in my lifetime that I would consider a good dog. Then again, I don't care for aggessive animals that need to be watched 100% of the time around family and friends or other dogs and pets.