I think these dogs are being trained to detect rapid blood sugar drops. They can occur naturally in people with reactive hypoglycemia (release too much insulin when sugar/carbs are consumed) or be caused by administering too much insulin. If your blood sugar drops too low, you can die. Other symptoms are things like dizziness, shaking, confusion, temporary vision loss, and coma. They specific symptoms vary by person and aren't easily noticed. I think these dogs would be great for children with diabetes.