Dogs inherently know that a peer wagging its tail to the right is friendly but a left-wagging tail means the dog is anxious. Scientists identified the significance of tail-wagging direction about six years ago and recently studied 43 dogs to determine whether dogs understand the tail-wagging message. It turns out they do, according to the study, which showed that dogs watching a left-wagging canine displayed signs of anxiety such as elevated heart rate, but those watching a right-wagging dog remained calm with no signs of stress.

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