Research is now suggesting something dog-lovers have long suspected – man’s best friend can tell the difference between our happy and angry faces.

Scientists at the Messerli Research Institute’s Clever Dog Lab in Vienna trained dogs to associate pictures of happy or angry faces with a reward.

In a subsequent test, the scientists showed the dogs images of human faces they had not seen in their training.

This suggested that dogs could spot the difference between the expressions.

Here’s the link:  http://www.bbc.com/news/science-environment-31384525

BTW I already knew this 🙂