Puppy Behavior: A Sensitive Period for Puppy Socialization

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How do we know when to start puppy socialization and whether it’s important?
You’ve probably heard that puppies need to be socialized, but how do we know this and what do we know? Most of the ground breaking studies were done in the 1950’s and 1960’s, one of which was performed by co-authors, David Freedman, John A. King and Orville Elliot and published in Science in 1962.