Cancer cells have a distinct smell that can be picked up by the super sensitive noses of dogs.
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Dogs can be trained to alert their diabetic owners when their sugar level rises very high and to run and fetch their insulin.
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Certain dogs are trained to work with the police for recovering drowned bodies.
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You can train your dog to detect polycarbonate, the biggest component in DVD's.
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Minerals and Ores
Dogs can be trained to detect minerals in rocks and earth.
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