Dogs Can Smell Cancer Before Any Machine Can
The most sophisticated disease detector on the planet costs kibble and belly rubs
Dogs can detect certain cancers with accuracy rates above 90% — using only their nose.
Key Facts:
- Studies show trained dogs detect lung, breast, ovarian, and colorectal cancer from breath or urine samples
- In a 2019 study, dogs detected lung cancer with 97% sensitivity and 99% specificity
- Cancer cells produce unique volatile organic compounds (VOCs) that dogs can smell
- Medical detection dogs are now being trialed in clinics and hospitals worldwide
The science is solid: cancer changes the chemical composition of breath, urine, and skin. These changes are undetectable to humans but obvious to a dog's 300-million-receptor nose. In blind studies, detection dogs identified cancer samples that had been deliberately mixed with healthy samples — and got it right nearly every time.
Dogs have also been trained to detect COVID-19, malaria, Parkinson's disease, and low blood sugar. The medical community is taking this seriously — research programs exist at Johns Hopkins, the UK's Medical Detection Dogs charity, and multiple universities worldwide.
💡 Did You Know? The first documented case of a dog detecting cancer was in 1989 when a Collie mix kept sniffing and nibbling at a mole on its owner's leg — which turned out to be melanoma.