Dogs tails are the most expressive part of their body. Happy and the tail wags frenetically. Sad and the tail is glued to the body. Indifferent and it flies at half mast. As Phillip Adams notes, perhaps humans could benefit from such an expressive signal, but it would be hard to function with such a visually expressive way of demonstrating how we are feeling, something that we don't deal with very well.
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