It's easy to know when your dog loves seeing you (or the treats you're offering) because he wags his tail, jumps with joy and follows you around endlessly . But what other emotions does your dog display to show his love for you?

Well according to new research from Japanese scientists at Azabu University , there's another level to the bond dogs have with humans and how they show it: tears of joy .

A first-of-its-kind study published in the Aug. 22, 2022, issue of Current Biology found that dogs do, in fact, shed tears. The idea to test whether it happened came to Takefumi Kikusui, a professor at the Laboratory of Human-Animal Interaction and Reciprocity at Azabu University, several years ago after his standard poodle had puppies. As he watched the mother nurse her litter, Kikusu

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