12 Scientifically Cute Facts About Puppies You Have To Know

3. THEY REALLY DO LIKE YOU.

In a Hungarian study published in 2005, researchers found that pet puppies show specific attachments to the humans that care for them. While even wolves that had been hand-raised from birth by humans didn’t show any preference for the people that raised them—they reacted the same way to strangers as to the caregivers they had spent their entire lives with—domestic puppies as young as 4 months old showed a significant preference to their owners. They followed and greeted their owners more than they did strange humans, and when their owner left, they tended to stand by the door waiting for them to return. This difference was observed in both puppies that had been hand-raised with extensive socialization and puppies that had been reared in a litter by their mothers, indicating that as a species, dogs have evolved to bond with their human owners.

4. THEIR SENSES DON’T DEVELOP UNTIL A FEW WEEKS AFTER BIRTH.

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When they’re first born, puppies only respond to warmth, touch, and smell. Their eyes remain closed, and they can’t hear. Puppies don’t fully developthe ability to hear until they are 4 weeks old, and it is not until 6 weeks of age, on average, that they develop full vision. Once their senses develop, they begin exploring the world in earnest, beginning a critical period of socialization.

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