Watch:These Unbelievable Dogs Can Sniff Out Cancer


At Medical Detection Dogs’ HQ, a major trial is underway where pets are taught to sniff out prostate cancer from urine samples provided by a local hospital. So far they have a 93% success rate.

The charity is also trialling whether breast cancer can be detected by dogs using something as simple as a breath sample.

Founder of the charity, Claire Guest, 52, knows first hand just how important a dog’s sense of smell is in detecting human disease. Her fox red labrador Daisy sniffed out a deep-seated tumour in her breast back in 2009, which would have otherwise gone undetected.

“She saved my life,” Guest told The Huffington Post UK.


Early detection is vital. In fact, more than 90% of women diagnosed with breast cancerat the earliest stage survive their disease for at least five years. This is compared to around 15% for women diagnosed with the most advanced stage of disease.

As Cancer Research UK puts it: “Finding and treating cancer at an early stage can save lives.”

The charity has a “no kennel” policy, which means all of the dogs who are trained there belong to real families.

Volunteers drop off their dogs first thing, who then spend the day being trained to detect cancer using a variety of urine, tissue and swab samples. After a day’s work, they go home to their owners, stretch out on the sofa and have their bellies rubbed.

One of the charity’s oldest and most loyal members is Guest’s dog Daisy.

Guest had already founded the charity at this point, and was working on a project determining whether dogs could detect bladder cancer by sniffing urine, when Daisy began acting differently around her.

“She became anxious and one day I took her for a walk, opened the boot of my car to let her jump out, but she wouldn’t go,” explained Guest.

“She kept nudging my chest, which led me to find a lump.

“After a few days I decided to go to the GP and get it checked out. I was diagnosed with a very deep-seated cancer and was told by my clinician that had Daisy not drawn my attention to it, it could have taken many years for me to find the lump and the prognosis would have been very poor.

“She saved my life.”


The esteemed labrador and her four-legged friends are trained by Rob Harris, the charity’s bio-detection manager.

In a typical training session, Harris will place 1ml samples into pots and place them around a metal carousel in a bio-detection lab – one of the samples will contain cancer.

Each dog will enter the room alone with a handler and walk around the carousel, anti-clockwise, sniffing the different samples.

Incredibly, it takes them less than a second to decide whether or not the sample before them contains cancer.

When they catch a whiff of the disease, they are trained to sit down in front of the sample and touch it with their nose to let the bio-detection manager and their handler know that they’ve found it.

The bio-detection manager will then notify the handler of whether the dog has sniffed the correct sample or not – and the handler can dish out a treat accordingly.

The centre’s invaluable work doesn’t just stop at cancer detection, it also trains medical assistance alert dogs to detect small changes in an individual’s personal odour triggered by their disease.

This alerts them to an impending medical event, such as a drop in blood sugar levels among people who have Type 1 diabetes or a collapse in people who have Addison’s disease.

“Dogs love sniffing and they love telling us what they’ve found,” said Claire Guest.

“We are now understanding the huge potential dogs have to help us. How we missed this for so many years I don’t know.

“I think the potential for this is absolutely huge and we’re only just beginning to scratch the surface.”

 Forward By Jennifer Rice Of Sugarsoil

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