According to a new study published in the journal Current Biology, Professor Takefumi Kikusui has found that dogs cry happy tears of joy when their owners come home.
A recent study found that many dogs also shed happy "tears of joy," much like people, when their favorite humans return from work. Dogs frequently hop around excitedly when this happens.
Six years ago, when the poodle belonging to Professor Takefumi Kikusui gave birth to puppies, the dog's expression changed as it breastfed the young. Tears welled up in his animal companion's eyes.
“That gave me the idea that oxytocin might increase tears,” Kikusui says in a media release.
Dogs cry, according to the study's author, but they don't run down their faces way human tears do. When Prof. Kikusui of Azabu University in Japan investigated his hypothesis, he found that dogs shed more tears than usual when they were reunited with their owners. They continued to cry at the same volume even when they encounte...
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