Life-saving dogs

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Studies have shown that dogs might have the ability to sniff out cancer. If true, the method could provide a cheap and potentially non-invasive way to detect the disease.

Now, researchers at the University of Pennsylvania's Working Dog Center are training three dogs how to sniff out samples that contain ovarian cancer markers.

"We're really excited about it," Dr. Cynthia Otto, director of the Working Dog Center and associate professor of critical care at Penn Vet, told