Say "Cheese," Fido: Can scientific data prove that dogs "smile" at their owners?

(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...

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