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They then reprimanded the dog to produce a "sad" reaction, causing the animal to pull a mournful expression with eyes cast down. Surprise, generated using a jack-in-the box, caused the dog to wrinkle the top of its head into something akin to a frown.
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Scientists prove you really can tell what your dog is feeling by looking at its face - Telegraph http://t.co/swRohX2Lwk

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