Tony and Radar 

 Radar, a Labrador, is specifically trained to smell Tony's dropping or low blood sugars and alarm him and his family members...

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.....The problem was that Radar is trained to be extremely  sensitive to prevent missing deadly low blood sugars. Frequently, the dog falsely alarmed the entire family, very often  in the middle of the night. 

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Now, 10  years after his islet transplant, Tony remains insulin free and Radar is still an important member of the family.