Scientists explain ‘puppy dog eyes’

Led by the University of Portsmouth, a team of UK and US experts compared the anatomy and behaviour of dogs and wolves. Dogs and wolves were exposed to humans for two minutes, during which the dogs raised their inner eyebrow more and at higher intensities than wolves.

It turns out our dogs have evolved human-like eyebrow muscles, which let them make the sad faces that melt our hearts, according to a new study published in the Proceedings of the National Academy of Sciences (PNAS)

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