If someone suffers from cancer, has diabetes or epilepsy, a dog may be the first to know about it. Studies showed that we may train dogs so that they could sense lung cancer, breast cancer, skin, bladder or prostate cancer. Scientists suspec that dogs sense ephemeral, untypical smells which are given off by cells that work improperly.

Dogs are also more and more often used as assisstance dogs helping people suffering from diabetes in whom increase or decrease of sugar level in blood poses danger to health. Specially trained dogs may detect the smell of such fluctuations (sweet smell when the sugar level is high, sour smell when it’s level is low) and alamr their owners before they begin to notice any symptoms.

The most mysterious, however, is the information that dogs may be able to predicts an epileptic seizure 45 minutes before its onset. We don’t know how they do that, but theories try to prove there’s an unknown smell or even a subtle difference in a person’s behaviour.

Source: www.livescience.com