A Labrador who experienced breast cancer in his mistress saved her life and inspired her to start a new charity that helped other people.

The Daily Mail writes about it.

Opening the trunk of the car, Claire Guest waited for her three dogs to jump out and rush for a walk, as they usually did.

But when the two did so, the third, Daisy, a labrador, remained in place, staring intently at his mistress, and then gently nudging her in the chest again and again.

Claire didn't think anything of it and kicked her out of the car. But as they walked, she touched the spot her dog was pointing to, and there she felt a bump.

Claire Guest with dogs / Photo: dailymail.co.uk

Doctors soon confirmed that it was breast cancer: the tumor was so deep and aggressive that it probably wouldn't have been detectable until it was too late.

But thanks to Daisy's early warning, then-45-year-old Claire was able to undergo surgery and radiation therapy to save her life.

Today we know that dogs' excellent sense of smell can detect all kinds of diseases, but when it happened in 2008, things were very different. However, Daisy managed to convince skeptics that the disease not only has a smell, but dogs can also identify it.

Claire co-founded the charity Medical Detection Dogs to prove this connection.

"I was able to stand up and say, 'This is science, look at it,'" says Claire, now 59. This combination was quite powerful. It made people sit down and think."

Claire, a psychologist by training, came to believe that dogs can smell sick years ago when she worked for another charity.

After meeting Dr. John Church, the couple founded MDD and soon proved that dogs smell bladder cancer in humans. In fact, Daisy also played an important role in this discovery.

Claire Guest / Photo: dailymail.co.uk

They soon proved that dogs could detect a multitude of diseases, and the charity began a program to train dogs to detect hypoglycemia attacks in patients with type 1 diabetes. It has since been expanded and now covers many other conditions.

Perhaps this is not surprising, since a dog's sense of smell is very amazing: while humans have about five million receptors in their noses, they have 350 million.

The charity has now grown so much that more than 80 people in the UK have a medical aid dog provided by MDD. But it doesn't come cheap: last year, their training and research cost around £2 million, all of which was raised through fundraising.

Claire Guest / Photo: dailymail.co.uk

Money is spent on many things. One of the employees trains assistance dogs that live with people with conditions such as postural tachycardia syndrome, Addison's disease, allergies, diabetes, and other endocrine disorders.

They warn their owners in advance of any flare-up of the disease so that they can either take medication or hide in a safe place. Thus, they help to significantly reduce the number of people who need hospital treatment annually.

But that's not the only important work the charity does. Their dogs, who are trained to detect diseases, are working to see if they can prove that Parkinson's disease has a smell that they can smell early on – five or ten years before symptoms appear. The charity also believes the same can be said for prostate cancer, colorectal cancer and bacterial infections.

Dog / Photo: dailymail.co.uk

This gives hope for new treatments, since there is currently no time for a cure and the disease is usually detected very late, and by this time it is already difficult to do anything.

Their research has proven to be so powerful that an American scientist — Dr. Andreas Merschin of the Massachusetts Institute of Technology in Boston — uses them to develop a sensor that can detect diseases by smell.

And it's all thanks to that day in 2008 when Daisy discovered Claire had the disease. Sadly, the Labrador passed away in 2018 at the age of 13.

"Putting her to sleep was one of the hardest things I've ever had to do," says her owner. "She died of breast cancer, and the saddest thing is that I couldn't do for her what she did for me."

Recall that the pensioner could not close his eyes for four years after unsuccessful plastic surgery. He decided to have surgery after becoming more and more ashamed of his "chubby cheeks."