(Natural News) When your dog looks up at you with its mouth open wide and its lips pulled up at the corners, is it really smiling at you? Despite humans having over 30,000 years of history with dogs, the answer is still unclear.

But researchers believe they are getting close to finding the answer. A group of neuroscientists from the University of Cambridge recently declared that non-human animals like dogs have emotions and the capacity to show intentional behaviors.

However, K.C. Thiesen, the director of pet care issues for the Humane Society of the United States, advises people not to think a dog’s smile is the same as a human’s smile. While almost all mammals have some sort of facial expression that they use when they are trying to be friendly, this expression in dogs doesn’t always mean approachability. When misinterpreted, it can lead to unpleasant canine encounters.

“Learning what [a] dog’s body language can tell you is super important, since a dog ‘smiling’ may or may not be approachable and friendly,” says Thiesen.

Maybe not a smile

Juliane Kaminski, a researcher studying dog cognition, also advises caution when interpreting a dog’s facial expression as a smile.

Dog owners, she says, should learn how to read the behavior of their pups instead because there’s zero data saying that a dog’s smile is really a smile. Humans have a tendency to anthropomorphize, especially when it comes to their pets. This makes them more likely to misinterpret their dog’s facial expressions.

According to a study published in the journal Scientific Reports, dogs can show distinctive facial movements in response to different emotional stimuli. However, these facial movements are not the same as those displayed by humans under similar conditions.

For instance, dogs often use a relaxed, open-mouth expression when they’re happy and trying to invite other dogs to play. However, there’s no evidence suggesting that dogs use this intentionally to try to communicate something to humans.

This finding may be disappointing, especially for dog owners and dog lovers out there. But Kaminski believes more research needs to be done, and they should include objective research techniques, such as the facial action coding system (FACS), which can measure every minute facial motion dogs make when interacting with people.