Why not? We are already training dogs to sniff out cancer long before standard testing can detect it.
http://www.cbsnews.com/stories/2005/...in665263.shtml
I remember seeing this one on TV not long ago. A guy demonstrated his dog's ability to sniff out cancerous cells by placing some between two bandages and sticking it to a woman's body. He also stuck several other bandages on her body and the dog knew exactly which one it was. Amazing!