When people hear the word socialization, they often imagine a puppy playing with lots of other dogs. Dog-dog interaction is only one small part of the picture.
The world contains more than dogs
A well-socialized puppy learns that different people, surfaces, sounds, environments, vehicles, handling experiences, and everyday sights can be normal and safe.
Elevators, umbrellas, vacuum cleaners, car rides, slippery floors, hats, bicycles, doorbells, and unfamiliar buildings can all become useful experiences.
Quality matters more than quantity
Exposure should be appropriate for the puppy. If the experience is overwhelming, forcing them closer doesn't create confidence. It can create the opposite.
Keep new experiences manageable. Pair them with food, play, distance, or another source of safety and enjoyment.
Let the puppy observe
A puppy doesn't have to interact with everything they see. Watching a person walk past from a comfortable distance can itself be valuable learning.
The goal isn't to make your puppy love everything. The goal is to help them develop flexible, confident responses to ordinary parts of life.