Do Dogs Really Cry 'Happy Tears'?

A first-of-its-kind study out of Japan set to find out, and the results were surprising to everybody.

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Azabu ,Saitama ,Japan ,Japanese ,Bogdan Sonjachnyj Shutterstock ,Takefumi Kikusui ,Harvard Women Health ,Laboratory Of Human ,Azabu University ,Current Biology ,Human Animal Interaction ,Harvard Women ,