Dogs wag their tails differently according to their mood
Happy dogs wag their tails more to the right (from the dog's point of view), while nervous dogs have a left-dominated swish and fellow canines can spot (and respond) to these subtle tail differences, a study in Current Biology reports. Canines that see tails wagging to the right are more relaxed, whereas they become more stressed when they see tails wagging to the left. (source: Psychology Today ) Resources: BBC National Geographic Psychology Today