“While people have long recognized and used the dog’s incredible sense of smell for many useful purposes, a whole new dimension unfolded in 1989 when two British dermatologists described a case where a pet dog kept returning to a skin growth on its owner’s leg. A biopsy confirmed that the growth was a malignant melanoma, leading to an intriguing possibility: could a dog’s nose actually detect cancer?” – From Roberta Pattison’s article in the Vet Topics 2007 Magazine (page 8 – 9) – Does Fido’s Nose Know?