Turns out, the direction in which your dog wags his tail can tell a lot about his emotional state: A wiggle to the right signals positive feelings, like excitement, while a left wag indicates negative ones, like uncertainty. What’s more, other dogs can pick up on these tail-wagging cues and respond accordingly, finds new research from study author Giorgio Vallortigara, PhD, of the University of Trento in the journal Current Biology. It’s a lot like feeling happy when you see someone smile or upset when you see someone crying.
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