He's my knight in shining armour with a waggy tail
Coco is a six year old chocolate labrador. He's also a life saver.
His owner Karen has Addison's disease. And when her cortisol levels get too low, she could slip into a coma or die.
Coco can smell when that is about to happen and will "alert" - staring at her or licking her aggresively.
Steve Harris from Breakfast in Dorset 103.8fm went to meet Coco (and Karen!) in Poole.