A puppy learns by exploring her environment, investigating everything in her path. To help her to mature into a friendly and outgoing adult, it's important to encourage exploratory and social behavior. Socializing your puppy to new things should be a positive and pleasant experience for her. Learning is stressful. Expose her at a rate that she can absorb new information, not be overwhelmed by it.
Socialization is an ongoing process of changes and additions in a puppy's life.
As she matures, she will develop a catalog of experiences that help her to manage the world at large. This includes forming relationships with all types of people, other dogs and different species in various environments. From three to twelve weeks of age, a puppy is in one of the most important developmental periods of her life. She is receptive to new things that later may prove to be more difficult for her to adjust to. Regular handling by a variety of people during this stage is essential for her to form positive attachments later.