Dogs for Diabetics

I was reading a magazine at Dollywood the other day, there is an organization Dogs4Diabetics that trains dogs to identify and act upon the scent changes that low blood glucose creates in body chemistry. The dog in the article was trained to bring a stuffed animal to the owner when the dog detected the scent letting the owner know they needed to take some sort of action. A trained dog costs $12,000 but the organization will attempt to train the family dog. I had read that dogs could be trained to detect some types of cancers and other unique situations but I had not heard about this.