You probably have heard that dogs can help people with diabetes control blood sugar levels. It turns out that these four-legged friends can prevent glucose surges, saving the lives of their owners! We will introduce you to the stories of three such friends. Amazing is the ability of dogs to detect changes of blood sugar levels by smell. This ability is especially valuable at night when the person cannot control the level of blood sugar. These dogs are very helpful to the children, as they are sometimes not able to recognize the symptoms of hypoglycemia or hyperglycemia. Thus, each day the same dogs save the lives of children and give a little tranquility to their mothers.