Im with everyone on being to young to be trained for that,
But even for an adult well trained "alert" dog, could they really track 1/2 mile away? What if there was another diabetic in the area, would it get mixed up? I know dogs sense of smell is quite strong but I just have a hard time seeing any dog be able to alert a drop on blood sugar from a half mile away with other people around and buildings, cars, etc.
Is this possible for any dog?