What is a dog’s reaction to sniffing out cancer? Dogs will sniff out cancer by sniffing frantically, spinning around, or making some strange movements. Not all dogs can sniff out cancer, and those who can have a fixed reaction to sniffing out cancer are professionally trained dogs. If a dog reacts strangely by sniffing its owner’s body, it does not necessarily mean that it is cancer, it may be that the owner’s body has a smell that attracts it. There are relevant studies that show that dogs can smell cancer. Dogs have a very sensitive nose, even a dog with a dull sense of smell has 40-60 times more sense of smell than a human. It is normal for dogs to be able to smell certain odors that may be altered in people who are ill.
