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Those "puppy eyes" are all for you

Photo: Alan Diaz / AP

"Puppy dog eyes" — the pleading look a dog gives by lifting its inner brow and widening its eyes — has become synonymous with a sad pup hoping for a scrap of food off its owner's plate. However a new study published Thursday in Scientific Reports suggests "puppy dog eyes" may not be meant to be manipulative, but are simply a reaction to human expression.

Key findings: The study, conducted by researchers in Britain who closely monitored dogs' facial expressions, found that dogs were much more expressive when a person was paying attention to them as opposed to when they were turned away. The presence of food didn't make a difference in the dogs' reactions.