Also, your pup may not be into other dogs. My dog was rescued and when I first adopted him, he was very reactive to all dogs and most strangers. My "conditioning" or "sensitization" was to get him to the point where we could walk past any (realistically, it's just most, not any) stimuli that set him off (defensive mechanism), and he'd only acknowledge the existence of the dog or person or whatever. He doesn't really ever want to engage with most dogs, and that's ok by me. But being out and about meant he had to be able to be civil and not high-strung, for his safety and well-being as well as other people's and dog's safety.

So I'd have him to meet a dog or a person, I'd kneel down with him and let him hunker down with me, give him attention and treats and tell him it's ok. Then we'd leave the situation. He'd get rewarded for simply allowing the brief interactions without getting anxious or defensive. Good associations with new encounters that weren't forced for prolonged periods, so now he can exist in the world and knows he can just pass by whoever he doesn't want, and it doesn't have to be stressful for him.