Queen Camilla hosted a very good group of royal guests Tuesday at Clarence House in London, welcoming a handful of compassionate canines to celebrate the 15th anniversary of the Medical Detection Dogs organization, a charity of which she is a patron.

The group trains dogs to use their extraordinary sense of smell to sniff out medical conditions such as COVID-19, Parkinson’s, malaria, or cancer. A recent study showed that dogs trained in this skill had a 94 percent accuracy record of detecting COVID-19. The trained dogs can also help their humans with diabetes, severe allergies, Postural Tachycardia Syndrome (PoTS), and more by detecting and alerting them to potential medical emergencies or episodes.

Camilla, who has been a vocal supporter of the charity since 2014, took in a demonstration of one of the organization’s dogs sniffing a variety of samples and identifying which of them signified an active Urinary Tract Infection. According to a release from Clarence House, the demo didn’t stop there, with another dog “detecting the odour of UTI on people through passive searching, demonstrating the work of the charity’s new project.”

The group has trained more than 200 dogs.

While cutting a ceremonial cake for the occasion, Camilla marveled at the dogs’ effectiveness.

“People thought, how on earth can these dogs sniff out all these diseases, but as you have seen today, seeing is believing,” she said.

Michelle Sutherland, who has an adrenal condition called Addison’s disease, is living proof of the impact the dogs can have on patients' lives. Sutherland attended the event and talked about her two-year-old medical assistance dog, Spring. She called the pup “a lifesaver.”

“He alerts four or five times every day, so he has given my independence back and allows me to live a normal life,” she said of her canine companion. “Without him, I would not be here now. I would spend a lot of time in hospital. I was always ringing ambulances and I was off sick for months at a time. Spring is completely oblivious that he has given me my life back.”

Of course, Camilla isn’t the only queen with a soft spot for dogs: The late Queen Elizabeth II famously doted on her array of corgis until her final days. She even secretly incorporated her favorite corgi, Susan, into her 1947 wedding to Prince Philip.