When is the critical socialization period for puppies and why is it important?

During the first 3-4 months of life, a puppy’s sociability outweighs fear, making it the best time to introduce them to new people, animals, and experiences. “Incomplete or improper socialization during this important time can increase the risk of behavioral problems later in life including fear, avoidance, and/or aggression” (AVSAB Position Statement On Puppy Socialization).