Dog owners and lovers know the look: head tilts to the side, inner brows lift up and eyes enlarge into cuteness overload.
And while many folks interpret the act as a manipulative plea from our innocent Fido, new research published in Scientific Reports finds that puppy dog eyes look, along with other facial expressions, is simply how canine friends engage with us.
The new research comes from the Dog Cognition Centre at the University of Portsmouth in the United Kingdom, where a team of researchers studied 24 pet dogs of different breeds ages one to 12 years by analyzing their facial expressions in different positions and situations.
Each of the dogs was paired with a lead in a quiet room with a video camera focused on its face.
The lead would either face the dog or face away from the dog while displaying or not displaying food and tried to keep her gaze away from the dog, ignoring its behaviors.
The dogs completed two trials on separate days.
The researchers found the dogs were more expressive when the lead was facing them and paying attention, but whether or not he or she had food made little to no difference.
The dogs also barked more and stuck their tongues out when they received attention.
"This simply shows that dogs produce more (but not different) facial movements when someone is looking at them," lead researcher Juliane Kaminski told the New York Times.
According to the Dog Cognition Centre’s Bridget Waller, who designed a dog version of the human Facial Action Coding System, those puppy dog eyes or the “inner brow raiser” expression in humans may indicate sadness in people, but there’s no evidence for the same in dogs.
Additionally, Kaminski actually warns against speculating why dogs use the look or that they use specific expressions to communicate a specific message at all.
“This kind of ‘dinner table effect’ that dogs try and look super cute when they want something is something we did in fact not find,” she wrote. “Dogs do not seem to produce facial movement as a kind of reflex to being aroused,” Kaminski wrote.
In fact, Fido’s expression may just be a reflection of your own.
The study should serve as a reminder that people respond involuntarily to their pets' actions, Brian Hare, professor at Duke University and director of the school's canine cognition center, told the New York Times.
Hare, who was not invovled in the study, added that when we interact with our dogs, physicial features and eye contact influence how we feel about them.
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