I actually saw a news story close to a year ago, where some guy’s dog got him medical help he needed. The guy was suffering from a hypoglycemic reaction.
I assumed it was just a random occurrence, but the cover article on latest issue of Diabetes Forecast talks about specifically training dogs to detect low blood sugars. The training for the dogs is something like $20,000. But they are apparently popular for diabetics that have are asymptomatic – these dogs are detecting hypoglycemia in their owners at the very beginning of the plunge, before it even becomes dangerous. Anyway, I’m not doing the article justice in my describing it, but it really is very interesting if you get the chance to read it.