Dogs are now being taught to detect breast cancer from a breath tube, after an animal Dr Guest was training to detect other cancers started to warn her.

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Two police helicopters, one with thermal imaging equipment, were also used to try to detect any trace of an animal.

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Dr Spire says it should be possible to detect many diseases within 12 hours of an animal becoming ill.

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In particular, this pivotal question must be asked: Does the dog have a history of really being able to detect the presence of hidden drugs, or has the animal simply signaled drugs in such a large number of encounters that by the law of averages he managed to catch a few real stashes?

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Dr Rossetti had previously established that this tends to reduce an animal's leptin production, presumably because the appropriate sensors detect that there is already enough of it around.

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The researchers first showed that structures on the animal's head were probably sensory organs, then found it could detect electric fields in water.

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The degree of difficulty and the scrutiny of demanding pet owners who can immediately detect flaws or imperfections in their loved ones keep many traditional taxidermists from the domestic animal sector, said Steve Wolk, president of the National Taxidermists Association.

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