A dog will wag its tail for a person or another dog and may do so for a cat, horse, mouse, or even a moth. If the dog is alone, however, it doesn't wag its tail. You've made me happy. Evolutionary biologists have noticed that many breeds of dogs, as well as jackals, wild dogs, dingos, and some wolves, have a distinctive white or dark tip at the ends of their tails. They believe the markings are designed to make wagging more visible to the other creatures they are wagging at.
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