If your dog is not food-oriented but toy-or-play oriented, bring along a favorite or new squeaky toy or tugowar toy to bring out and hold B4 him as you fast-circle-walk/fast-run him so that he focuses intently on the highly-valued toy and activity. Usually it's the herding/working type dogs that are more toy/tugtoy-oriented but whatever works to get your baby's attention off the stress trigger and onto something positive in conjunction with a fast-paced activity where he has to work physically hard to keep up - all fashioned by you into a calm but upbeat, happy intervention activity that smack right into the stress-trigger and gradually replace it, together with mild medication, can help your dog learn to associate past stress triggers with new, happy, fun, rewarding activities and powerful praise from you.
Your calm, in-charge demeanor during this reprogramming it utterly critical. Don't feel sorry for him, that won't help. Just show your boy a confident, leader who knows how to help him and even during setbacks will always be there to keep him pointed forward with self-assurance. So train yourself how to stay calm even if your dog is seized with temporary terror to always send the message there is nothing to fear really.
Lots of truly, heartfelt(make it straight from your heart & it will speak directly to his little soul) praise when he is calm and participating in your happy walk intervention program go a long way toward reprogramming his brain.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |