This video goes over tips for dog trainers using positive reinforcement while working with issues such as fear, reactivity, shyness and aggression in dogs. The tips in this video are on the topic of being conscious of your own movement and orientation toward the dog.

Here is a video that illustrates how the difference in movement toward or away from a dog can cause the dog to have a negative emotional response or a positive emotional response: https://www.youtube.com/watch?v=71T6K9IU9P0