Can Dogs Really Help Us Detect Cancer?

We already know that dogs possess an amazing sense of smell, but their powerful sniffers have been back in the news lately for a very new reason. As more and more research is being done, we’re starting to realize that their strong sense of smell might even be powerful enough to detect cancer in humans!

Dog Thats Right Meme

Credits:WilleeCole Photography/Shutterstock

Cancer-Detecting Dogs

In 2009, Dr. Claire Guest, an animal behaviour expert, took her three dogs for a walk. She opened the back of the car to let them out for the walk, and two of the dogs immediately leapt out. The third, however, didn’t move at all. This dog was Daisy, a labrador, who then began nudging Claire in the chest with her nose. Later, Claire realized that the area Daisy had nudged actually really hurt. She decided to get tested, and found out that she had breast cancer. The early detection likely saved her life.

Claire and Daisy

Dr. Claire Guest with Daisy

This incident made Claire more confident than ever that dogs could help for detecting cancer. She had already co-founded Medical Detection Dogs in 2008, a charity that takes in abandoned dogs and trains them for detecting various diseases.

Currently, the charity has gained approval from a British hospital for further trials after an initial trial with the specially trained dogs showed that the dogs had a 93% success rate in detecting prostate cancer by sniffing the urine samples of patients.

medical detection dog

A ‘Medical Detection Dog’ At Work

How Are Dogs Doing This?

As we know, dogs have a fantastic sense of smell and can detect minute amounts of certain substances in the air in a way that humans aren’t even biologically capable of doing. Dogs can detect very small amounts of VOCs (volatile organic compounds) in the air, which is thought to be the basis of their ability to detect various forms of cancer, blood-sugar levels in diabetics, and even the specific mood that a person is in!

Dog Math Meme

Credits:Brian Goodman/Shutterstock

As for their ability to detect prostate cancer from urine samples, it is assumed that volatile molecules (molecules that tend to easily escape into the air) associated with the tumor are being released along with the person’s urine. These are the molecules that the dogs are detecting. In a sense, the dogs can actually “smell” the tumor!

What Lies Ahead?

These specially trained cancer-detecting dogs actually have a higher success rate when it comes to detecting cancer than most traditional tests, but people are still obviously skeptical about it. Despite the skepticism, it would be unwise for them to disregard this amazing ability.

It is hoped that the trials will be successful, at which point the dogs can be used as an optional test in cancer clinics. Just as Daisy did for Claire, dogs have the ability to save the lives of many more people due to their extraordinary sense of smell.


  1. Canine Cancer Detection – Wikipedia
  2. National Geographic
  3. Diagnostic Accuracy of Canine Scent Detection in Early- and Late-Stage Lung and Breast Cancers – CiteSeerX
The short URL of the present article is:
Help us make this article better
About the Author:

Brendan has a Bachelors of Science degree in Biotechnology from Mumbai University (India). He likes superheroes, and swears loyalty to members of the Justice League. He likes to take part in discussions regarding the human body, and when he is not doing that, he is generally reading superhero trivia.

Science ABC YouTube Videos

  1. How Does A Helicopter Work: Everything You Need To Know About Helicopters
  2. Rigor Mortis, Livor Mortis, Pallor Mortis, Algor Mortis: Forensic Science Explains Stages of Death
  3. Why Is Space Cold If There Are So Many Stars?
  4. Tensor Tympani Sound: Why Do You Hear A Rumbling Sound When You Close Your Eyes Too Hard?
  5. Hawking Radiation Explained: What Exactly Was Stephen Hawking Famous For?
  6. Current Vs Voltage: How Much Current Can Kill You?
  7. Coefficient Of Restitution: Why Certain Objects Are More Bouncy Than Others?
  8. Jump From Space: What Happens If You Do A Space Jump?