Certain dogs have the ability to detect cancer in humans by scent. The first reports of dogs possibly having the ability to sniff out cancer came in the late 1980s.

A six year old black labrador retriever by the name of Marine will be the world's first cancer-sniffing dog to be cloned. Marine was not able to reproduce naturally due to the loss of her own womb from cancer.

Marine is owned by a trainer at St. Sugar Cancer Dog Training Center in Japan. Her cloned fetuses were implanted into a surrogate mother dog in South Korea. The pups will be born in the end of May of 2008.

In 1989, a pair of dermatologists in London reported a case where a woman had malignant melanoma that was detected by her dog. The woman's dog would constantly sniff at the mole and at one point even tried to bite it off .

A study was done in 2004 which proved that ordinary household dogs were able to detect cancer in the urine of patients with bladder cancer. The study also proved that dogs could also be trained to detect cancer.

Another study was done in 2006 which proved that dogs were able to detect lung and breast cancer through the breath of patients.

• The Speculist: Cancer Sniffing Dog Update (January 10, 2006)

• New York Times (Editorial): What the Nose Knows (January 21, 2007)

• Paw Persuasion: Cancer Sniffing Dogs (December 9, 2007)

• Google Blog Search: Cancer Sniffing Dog

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