Dogs Trained to Smell Low Blood Sugar Levels May Save Lives: Dogs can be trained to use their sense of smell to recognize illegal drugs and explosives. So Mark Ruefenacht wondered if the animals also could recognize changes in the blood sugar level of people with diabetes.
Ruenfenacht has had the disease for much of his life. In 1999, he almost died while training a young dog to be a guide dog for the blind. Without any warning, his blood sugar suddenly dropped to a dangerously low level.