This story comes from Florida about a dog who dialed 911.
A Beagle named Belle started clawing at his owner when the owner started acting funny. Belle's owner was diabetic. When the owner's blood sugar fell and he passed out, Belle ran to the phone and called 911.
How could Belle do this? Well, Belle is a trained service dog - trained to help his diabetic owner. Dogs are able to sense high and low blood sugars. Dogs can smell many hundred times better than humans. When your blood sugar starts to rise, your breath starts to get a sweet smell to it. So you're able to tell the highness. But when you start to drop into the low, it drops into the seizure.
As a part of Belle's training - if she detects problems - she finds her owners cell phone and bites down on the #9 key. The phone then connects and Belle barks or whines into the phone. This alerts someone to call for help.