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How do 'diabetes dogs' detect low/high levels of insulin?

Asked by Ame_Evil (3051points) June 22nd, 2010

I recently (well 2 minutes ago) read this article:

http://www.dailymail.co.uk/health/article-1288589/Diabetic-girl-6-life-saved-times-WEEK-dog-sniff-needs-insulin-injection.html

I was wondering how do these dogs detect whether someones blood sugar levels are low/high? Also how are they trained?

Another question I wanted to ask is why don’t they just buy a machine to do this. I know dogs are cute and stuff, but surely a machine would be more cost effective?

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