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Dogs are very sensitive not only to odours but also to behaviour. As any dog trainer will tell you dogs can be react to the tiniest cues from their owners.
Even if it turns out that dogs are cued by behaviour, not smell it does not detract from the very real possibility that a hypoglycaemic event will change the composition of a patient's breath. Whether that's detectable with existing analytical techniques in a way that can be helpful for patients is another matter.
J. Rueda
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