My JoJo(American Staffordshire Bull terrier/same thing as pitt) was never taken to a "trainer". Her parents were both champion pullers, and they enjoyed what they did. They were both trained very well, non-aggressive towards anything, but they all growled when they played, but it was just a playful growl. She was trained by her breeder, though she tries to play dumb a lot, she is very good with every thing except heel, when she goes for a walk, she's in control. You don't take her where she wants to go and she'll take you. He parents pulled, so can she. She was never trained for pullin, only for showing, but she decided to chase a parked car on day last year and hurt her nose, and put her out of the show ring. She is a sweetheart, and very protective of her brother Artica and her sister Sahara. She had a problem with cats, so when we moved, a friend kept her for a couple of weeks, so the kittens could get their smell about the house, and when JoJo came home, she smelled the cats, and decided they were here 1st. She quit trying to hurt them and now they lay together.