Telltale tails.

• Position: Dogs - Brief article

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Dog lovers may think that a vigorously wagging tail means "I am sooo happy to see you," but it turns out to be more complicated than that. The direction of the wag also counts. A recent study at two Italian universities found that when dogs feel positive toward something or someone, their tails wag more to the right side of their rumps; when they have negative feelings, their tail-wagging is biased to the left. For the study, the researchers recruited 30 family dogs and placed them in a cage with cameras that...