Why do dogs wag their tails?
JOE GOODMAN, VIA EMAIL
Dogs ‘talk’ with their tails. The position of the tail can tell us a lot about how a dog is feeling; hung low suggests fear and submission, whereas held high is a sign of dominance and arousal. A wagging tail often conveys happiness and excitement but neuroscientists at the University of Trento in Italy have found that the speed and direction of wag is important in ascertaining if the dog is either negatively (slow and to the left) or positively (fast and to the right) stimulated. CC