According to studies, when dogs see their owners again, their eyes become teary.

When dogs are overcome with emotion after seeing their owners again, per a new study. they cry more. When canines see unfamiliar humans, the similar increase, according to the study, is not observed. The scientists hypothesized that crying would potentially strengthen the relationships between a dog and its owner. Join our weekday newsletter list to receive original analysis, news, and trends in your inbox. According to recent research by Japanese scientists, if your dog appears to be going to cry when it greets you, it’s probable that those tears are ones of joy.

In their study article, which was peer-reviewed and published in the journal Current Biology, the researchers claimed that they had discovered a link between a dog’s emotions and the quantity of tears that it sheds.

This is the first time that an animal’s tear production has been connected to its happiness, despite the fact that dogs have tear ducts that can produce tears just like humans do.

The 18 dogs who were reunited with their owners after being separated for five to seven hours underwent the Schirmer test , which includes applying a paper filter to the lower eyelid to collect moisture, according to the team.

In comparison to when they were alone, they claimed that the dogs secreted much more tears during the first five minutes of reuniting with their owners.

Another experiment was conducted by the researchers in which 20 canines interacted with an unfamiliar human. They claimed that this time, the dogs did not cry more tears than usual.

The group also proposed a link between a dog’s tear production and oxytocin, the hormone that promotes love and connection.

In a third experiment, 22 dogs received oxytocin injections into their eyes. The rise in tear production was not seen when the researchers dropped a non-oxytocin solution into the pups’ eyes, but the researchers said the canines started to make more tears when this occurred.

Takefumi Kikusui, the study’s lead author and a professor at Azabu University’s Laboratory of Human-Animal Interaction and Reciprocity, told The Guardian that the inspiration for the study came to him after he noticed that one of his poodles started crying while nursing her offspring.

That made him think that oxytocin might make people cry more, he told the publication. “We have previously seen that when dogs and owners connect, oxytocin is released in both of them,”

In their study, the researchers found that when dogs see their owners again after a long absence, they show joy and emotion by jumping up, licking their faces, or wagging their tails.

The study’s authors hypothesized that crying eyes can also improve the attachment between a dog and its owner.

Another experiment was carried out by Kikusui and his associates with 74 human subjects. Each subject was shown ten images of five canines, some of which had wet eyes.

On a scale from one to five, the participants were asked how much they wished to take care of each dog. According to the test results, 10% to 15% more persons expressed a desire to care for dogs who had tears welling up in their eyes.

In humans, babies cry to communicate their unpleasant emotions to their parents, and the parents respond by being more nurturing. In this study, we discovered that seeing at an artificially crying dog can also make people feel sympathetic.