Did That Dog Just Smile at You?

You come home after work and the family pooch greets you, grinning ear to ear. That's a true expression of emotion, right? Your dog is really showing she is happy to see you? Most likely, according to new research that for the first time documents and catalogues changes in the facial expression of laboratory mice in response to a particular emotion, pain. And although a dog is different from a mouse, all pets probably express emotions in much the same way that humans do, according to Jeffrey...Full Story
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