My dog is a 100lb pitbull purebreed. She's always barking at people when we walk her on the street. She's friendly, however, when outside with me or the kids, her bark is loud and deep. How can I get my dog to stop barking at strangers and remove her feeling of "threat"?

Ensure that when you walk her to use a prong collar. Ensure the collar is not loose on her neck, but high up and tight (cannot move easily) under her ear. This will make sure she doesn't take sudden movements and allow her to ensure that you will direct her whether the oncoming distraction is a threat.