Even a blink could mean something to your dog

Dog owners already know their pets can be remarkably good at reading a room. A raised voice, a smile, the rustle of a food packet – very little seems to escape their attention.

Now scientists have found that dogs may be responding to something even subtler: the humble blink.

A recent study from the University of Parma in Italy found that dogs blinked more frequently when they watched their owners blinking, suggesting that an action usually thought of as purely physiological may also play a role in dog-human interaction.

As reported in The Guardian, the researchers tested 35 dogs of different breeds. Each dog watched short videos featuring three people: its owner, an unfamiliar man and an unfamiliar woman.

In one set of clips, the people blinked roughly once every three seconds. In another, they simply looked ahead without blinking.

The dogs were then filmed so researchers could count their own eyelid movements.

The result? Dogs blinked significantly more while watching the blinking videos than the still-gaze versions, and their response was stronger when the person on screen was their owner rather than a stranger.

More than keeping eyes moist?

While compelling, that does not mean your dog is necessarily thinking, “You blinked, so now I will, too.” The researchers found no clear evidence of precise blink-for-blink synchronisation.

In other words, the dogs were not consistently blinking immediately after a human blink. Instead, the increased blinking may reflect heightened attention, automatic mimicry, or some broader social response to a familiar person.

Blinking, of course, has an important practical job – it helps lubricate the eye and clear away dust and debris. But in humans, blinking can also change depending on attention, social interaction and emotional state.

Scientists are increasingly interested in whether the same may be true for other animals.

The Parma team previously found that dogs blink more when watching videos of other dogs blinking, suggesting the behaviour may have some relevance in dog-to-dog communication as well.

Taken together, the findings raise the possibility that blinking is part of a much larger collection of subtle signals dogs use during social encounters.

One of the most interesting parts of the latest study is that familiarity appeared to matter. The dogs did not react in the same way to unfamiliar people, suggesting their response may be influenced by the social importance of the person they are watching.

That fits into a growing body of research showing just how closely dogs monitor human faces and behaviour. Another study published this year found that dogs could distinguish between some negative human facial expressions – including fear, anger and sadness – based on patterns of brain activity.

So, should you start blinking at your dog? You can certainly try – just don’t assume you have discovered a secret canine language. The researchers stress that more work is needed to understand what the extra blinking actually means.

For now, the finding offers a sweet reminder that communication between dogs and humans is not limited to commands, barks or wagging tails. It may be happening literally in the blink of an eye.

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