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A new study (University of Trento) shows dogs communicate with each other using their tails, and new research is helping to decipher what each tail wag means because the direction of the tail wag turns out to be very important. When canines are distressed, such as when they see an unfriendly dog, they tend to wag their tails to the left. The study found that dogs that see another dog wagging to the left experience anxiety and increased heart rates. Dogs that see another dog wagging to the right stay perfectly relaxed. The researchers don't think that dogs are intentionally communicating with their tails, in the way that some humans communicate visually with sign language. Instead, they believe it's more of a byproduct tied to the inner workings of doggy brains.