These research results do not surprise many pet owners. A dog named Trudi kept sniffing at her owner's leg. The owner went to the doctor, who found that the man had melanoma. This is a form of skin cancer that can be deadly. The dog identified it early, before it spread Another patient was treated for cancer, but her dog kept sniffing and making noises at the cancer site. The doctor had not removed all the cancer. Once again, a dog identified its owner's cancer. What makes dogs a species of animal that is so good at detecting cancer? Diseases such cancer produce smells. Dogs can smell as much as 10,000 times better than people and much more of the do (brain is related to the sense of smell smelling things is a large part of a dog's life. Will a visit to the doctor soon include a sniff from a friendly animal? 9 Some people think this is not a bad idea. It is less expensive than a lab test, and it doesn't hurt! Pet owners: Pay attention when your dog or cat strat acting differrently.