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My old dog could sense my mother's low blood glucose from across the room, so I'm assuming we'll all be breathing on our watches before too long.

But was it sensing low blood sugar itself or the behavioral changes of low blood sugar?

She'd wake her up in the middle of the night, but there certainly could have been some behavioral cue.

It was sensing her keto acidosis caused by low blood sugar. It has a distinct fruity smell which any dog can be trained to recognize.