It sounds like a
Lassie TV episode, but it's truth, not
fiction. Dogs can sniff out a dangerous drop in blood sugar in a
diabetic owner and alert the person to take action by pawing, licking,
whining, or barking. A few dogs have even been trained and placed as
diabetic service dogs. Their nose for hypoglycemia (low blood sugar) is
correct 90% of the time, according to their trainers.