[yorkietalkjilly]

He could likely still use desensitization training and socialization techniques so that he behaves appropriately around all he approaches, preventing him from ever going pitbull, Rottie or Yorkie-devil on any dog or human. If he were mine, I would reward only after he gives the behavior I like to mark that behavior vs. turning and quickly walking away with him, moving very fast in the opposite direction so that he has to focus only on keeping on his feet and up with you, before he goes ballistic but any time he begins to focus in on, alert to or tense up when approaching another human or dog. Eventually he should begin to see which behavior gets him a reward and which gets him quickly removed from the scene for even thinking about going ballistic and begin to police himself as he finds out the former is ultimately more self-gratifying. To be a good dog handler of a highly excitable dog, unfortunately, you have to watch them like hawks when out on walks and stay ahead of them to prevent behavior you don't like and reward behavior you do, which eventually teaches them which is more rewarding. They eventually get it, just don't give up on the training for it can take two months to get them on board and longer still to imprint their brain with your good behavior training techniques.