Thanks to natural selection, dogs may make puppy eyes because they know humans like it.
Dogs differ from wolves in many ways — they have shorter snouts, smaller sizes and more expressive faces. And unlike wolves, dogs heavily rely on human eye contact, whether it’s to know when someone's talking to them or to get help with a problem like hopping a fence or getting out the door.
An illustration of the facial musculature in the dog and wolf. The anatomical differences are highlighted in red.
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