I had a pit bull X shar pei, best dog I ever had, it would wait till I went to sleep than escape to get some pussy, play with other dogs, fight (for a couple weeks only, didn't know how it was getting out at the time). but always came back, either the way it got out or it would be sleeping at my front door in the morning
would eat anything, Lollies, apples etc. it always preferred human food, its how you raise it 99% of the time
people just have them to guard there back yard, they play with them rough as a puppy, and once its big, they'll never play with it again. or use it to walk the streets so they don't get rolled