If you just take him out and don't actually engage him/train him around the other dogs, it is going to make it WORSE because he is going to be self-rewarding himself for doing it.
Don't use a choke chain. Use a martingale or a prong collar fitted properly. Get a clicker and try Look at That training- works marvelously for reactive dogs.
Danielle, owner of...
Fraggle Rock Collars
Fraggle Vom Richcreek CGC CA
Red Dog's Reconnaissance Man CGC
General Patton Vom Winter Storm