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STUDY: Dogs Use Their Expressions to Communicate with Humans

Study shows dogs change their facial expressions in direct response to human attention.
dog communication study

When he looks up at you with those big puppy dog eyes, do you ever feel like your dog is trying to tell you something? According to a new study out of the U.K.’s University of Portsmouth’s Dog Cognition Center, you may just be right.

In a study of 24 dogs of various breeds, researchers tied each dog to a leash three feet away from a person. The dogs’ faces were filmed throughout a range of exchanges, from the person facing toward the dog, to being distracted with her body turned away from the dog. Throughout the interactions, the dogs’ faces were measured using DogFACS, a coding system that gives a measurement of facial changes.

The study showed that dogs use more facial expressions when humans are looking at them. This is the first study to find clear evidence that dogs change their facial expressions in direct response to human attention.

Moreover, these facial expressions did not appear to be simple emotional displays. For instance, when given food treats, the dogs’ facial expressions did not change unless someone was watching. This finding suggests that the dogs produce facial expressions to communicate, said the researchers.  

“We can now be confident that the production of facial expressions made by dogs are dependent on the attention state of their audience and are not just a result of dogs being excited,” said lead researchers and dog cognition expert Dr. Juliane Kaminski. “The findings appear to support evidence dogs are sensitive to humans’ attention and that expressions are potentially active attempts to communicate, not simple emotional displays.”

The “puppy dog eyes” look—that guilty, sad look dogs achieve by raising their eyebrows and making their eyes appeal larger—was the most commonly observed facial expression. This expression tends to elicit sympathy in humans, which Kaminski believes, may indicate that dogs have developed facial expressions due to domestication.

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