Dogs can smell cancer, study says. In German study, canines beat machines in detecting lung cancer.

photo "Researchers from Schillerhöhe Hospital in Germany have published a study in the European Respiratory Journal that shows that dogs can detect lung cancer by sniffing human breath.
Two German shepherds, an Australian shepherd and a Labrador retriever smelled test tubes containing breath samples from 220 patients, only some of whom had lung cancer. The researchers trained the dogs to lie down in front of the test tubes where they smelled lung cancer and touch the vial with their noses, according to CNN.
The dogs sniffed the presence of lung cancer in 71% of samples from lung cancer patients and had a low rate of false positives, correctly identifying 93% of the cancer-free samples, Reuters reports..."Read here