What is socialisation and why does it matter? The period between 3 and 4 months of age (approximately 12–16 weeks) is one of the most important stages in a puppy’s development. During this time, puppies actively explore the world and begin to form their attitudes towards unfamiliar people, objects, sounds, and situations. It’s essential that puppies are gently exposed to a wide variety of new experiences during this stage — in a safe, calm environment and with neutral or posi