not a pitbull, but a golden lab.
my bf has a 98 lb golden lab and mocha is only about 5 lbs. being the princess she is, she bosses his lab around the house. mickey (golden lab) is 5 years old and mocha is almost 1, but he's more of a father/grandpa to her. she likes to nip (she's teething) at him and he doesn't mind except growl at her when she's out of line.
other than that, they get along very well. a couple of pictures of them together.
1. outside, enjoying the weather.
2. mickey showing mocha where to pee/poop.
3. i think this was when he barked at her and she figured out how to hide under the chair, because she thinks he can't reach her from there.
4. playing soccer with a tennis ball.