Dog Smelling Cancer May Lead to Less Invasive Tests

A dog trained to sniff out colorectal cancer was almost as accurate as a colonoscopy in a study that suggests less invasive tests for the disease may be developed.

The Labrador retriever was at least 95 percent as accurate as colonoscopy when smelling breath samples, and 98 percent correct with stool samples, according to the study, published today in the medical journal Gut. The dog’s sense of smell was especially effective in early-stage cancer, and could discern polyps from malignancies, which colonoscopy can’t.