Is yawning contagious for dogs, too? In 2011, U.K. biologists tested for contagious yawning between people and man’s best friend. Although 5 of the 19 dogs they studied did yawn in response to ...

Or perhaps a yawn is a physical expression of our human ability to share, human empathy wired into a brain, although maybe not just our brains. Dr. PROVINE: For example, if you see your dog or cat ...