Refer to The Dog Walker's Handbook for more details.
Pit bulls are sweet, nice dogs. We saw an adorable little pit bull puppy at the park yesterday. For a while, Econo-Girl and Leisure Lad ran an unofficial pit bull rescue in Columbia Heights, DC. People would just dump them on our lawn, and we would find good homes for them.
Most shelters just kill them.
For every dog that comes into our home, we start immediately taking food out of their mouths. From the first minute. And toys. socks, etc.
Another thing we do is to put our faces near the dog and scratch their bellies. Since we primates insist on putting our faces near dogs, even strange ones, Leisure Lad and myself want our dogs to be very used to that.
Actually, in dog world it is considered very rude and aggressive to put your face near a dog's face. It's a great way to get bit in the face.
We also have the dog around children and other dogs as much as we can, so they can get used to it.
Remember, you are your dog's leader. He looks to you for protection and guidance. So provide it. Don't be one of these people who hides behind an imposing dog, thinking it is their protection. It's not good for you or the dog.