Those ‘puppy dog eyes’ are for us humans only

New research shows dogs’ expressions are likely to change for their audience

Dogs give their “puppy dog eyes” look when humans are looking at them but are unlikely to alter their facial expressions for food, according to new research.

Scientists at Portsmouth University’s Dog Cognition Centre say they are the first to find clear evidence that dogs move their faces in direct response to human attention.

A spokeswoman said: “Dogs don’t respond with more facial expressions upon seeing tasty food, suggesting they produce facial expressions to communicate and not just because they are excited.

“Brow raising, which makes the eyes look bigger – so-called puppy dog eyes – was the dogs’ most commonly used expression in this research.”

Dr Juliane Kaminski, who led the study published in Scientific Reports, said: “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.

“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’ attentionandexpressionsarepotentially active attempts to communicate, not simple emotional displays.”

Dr Kaminski said previously it was thought animal expressions were involuntary and dependant on the individual’s emotional state, rather than being a response to their audience.

She suggested dogs’ facial expressions might have changed as part of the process of becoming domesticated.

The researchers studied 24 family pet dogs of various breeds, with them aged one to 12.

Each dog was tied by a lead a metre away from a person and the dogs’ faces were filmed throughout a range of exchanges, from the person being oriented towards the dog, to being distracted and with her body turned away from the dog.

The dogs’ facial expressions were measured using DOGFACS, an anatomically-based coding system which gives a reliable and standardised measurement of facial changes linked to underlying muscle movement.

Picture: PA. Dogs give their “puppy dog eyes” look when humans are looking at them but are unlikely to alter their facial expressions for food, according to new research.