Dogs use 'puppy eyes' in response to humans: study
Dogs give their "puppy dog eyes" when humans are looking at them but are unlikely to alter their facial expressions for food, according to new research.
Scientists at the University of Portsmouth say they are the first to find clear evidence that dogs move their faces in direct response to human attention.
"Brow raising, which makes the eyes look bigger, so-called puppy dog eyes, was the dogs' most commonly used expression," a spokesperson said.
The study was published in 'Scientific Reports' and Dr Juliane Kaminski, who led it, said: "In our study, they produced far more expressions when someone was watching, but seeing food treats did not have the same effect.
"The findings appear to support evidence dogs are sensitive to humans' attention and that expressions are potentially active attempts to communicate."