Dogs as a diagnostic tool for cancer?

I've just discovered the perfect reason to own a dog! All dog lovers out there: rejoice! If dogs could sniff out cancer from urine samples with a reasonably high statistical accuracy, as is indicated in this article, what more miracles can these furry creatures bring to our miserable existences?

Of course, I cannot imagine some paranoid human owning a trained-in-sniffing dog just for the purpose of identifying any self-threatening disease...

I want my shetland sheepdog :(