The technique here is to go outside and sit on a park bench. Whenever you see another dog you say "oh, look, here comes a cookie dog." And as soon as your dog sees the other, you give him a treat. Even if your dog is tense and growling and one might say that you are rewarding the dog for growling and acting badly around other dogs, things will improve quickly. The dog cannot help but make the positive association between the approaching dog and the cookie and soon he will look forward to other dogs approaching. Any time your dog acts appropriately when a dog approaches, offer a reward. Be sure you give your dog enough space from the other dog to feel safe and comfortable. And watch for early signs of discomfort, such as yawning, and excessive panting or activity. You don’t want to push your dog too far too fast.
Clever.
Mingus needs some work in this area, for sure. Or, I suppose, I do.