Ecstatic canines can well up when they are reunited with their human companions, a study suggests.
Dogs can cry tears of joy when they are reunited with their owners, a small study has found.
Canines may be genuinely thrilled when they see their human companions after a long period of absence, Japanese researchers have said., based on the behaviour of 22 dogs, looked at the reactions of dogs who were reunited with their owners and with other people they knew. To test their theory, academics at Azabu University and Jichi Medical University placed strips of paper under the eyes of the dogs during normal interaction with their owners and a minute before they were reunited with them after five-to-seven hours of separation.
They discovered when the dogs saw their owners, it was the only time they shed tears. There was not the same level of increased tear production when the dogs were reunited with the people they were familiar with, but were not their owners.To see whether the tears were linked to their emotions, the researchers applied a solution containing oxytocin, a key hormone involved in bonding, to the dogs.
"We had never heard of the discovery that animals shed tears in joyful situations, such as reuniting with their owners," said Takefumi Kikusui, one of the authors of the study in the journal Current Biology.
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