Dogs have nose for COVID-19, studies show. Why aren’t they used for testing?

As the availability of COVID-19 tests dwindle across Canada, another option to detect the virus in the form of a furry friend may be the next best thing.

Multiple studies show that dogs can be more effective, faster and potentially less expensive than the current tests on the market.

The research has grown since 2020, with University of California Santa Barbara professor Tommy Dickey finding the collective research shows trained scent dogs are “as effective and often more effective” than both the rapid antigen tests many people keep in their homes, and even the PCR tests deployed at clinics and hospitals.

But even with studies showing their effectiveness, COVID-19-detecting dogs are deployed only in certain jurisdictions in various countries.

One such place is the Canines for Care program at Vancouver Coastal Health (VCH), which started looking into the possibility of training dogs to detect COVID-19 in early 2021.

Dr. Marthe Charles, division head of medical microbiology and infection prevention and control at VCH, said the idea stemmed from the early reliance on laboratory testing.

“I think there was a will from public health at the time and also from the various levels of government to try to find a way that was fast, accurate and non-invasive to be able to detect and train as many people as possible,” Charles told Global News in an interview.

Three dogs — two Labrador retrievers and an English springer spaniel — were brought in for training. The dogs were exposed to items such as masks that were worn by patients either negative or positive for the virus. This trained the dogs to recognize what is and is not COVID-19.

Click to play video: 'Health Matters: COVID sniffing canine'

Charles said the dogs were trained since being puppies to associate the scent of COVID-19 with food and were rewarded each time they correctly detected a positive case of the virus.

“So from early on in their lives, they’ve associated the scent of a case of COVID to a rewarding scent,” she explained.

This reward method is not just used by VCM. It was also used with a group of dogs sourced in early 2021 for a French study, trained at detection using toys — usually tennis balls — as rewards.

Dr. Carla Simon, owner of Hunter’s Heart Scent Detection Canines in Calgary, said this method of training dogs is common. By using rewards, it can help motivate them to find the scent.

“We would pair, let’s say, the sweat samples with COVID, with their reward, and they notice that every time they find their reward, there’s that special smell,” she explained. “We just have to make it rewarding for the dog.”

She added, however, that the dog chooses the reward so trainers can ensure the canines “show up every day and want to do their job.”

Earlier this month, Dickey along with Heather Junqueira of BioScent, Inc. gathered several peer-reviewed studies into a review that was published in the Journal of Osteopathic Medicine. Dickey said the number of peer-reviewed studies over the past few years went from four to 29, incorporating the work of more than 400 scientists from more than 30 countries and 31,000 samples.

The review noted the effectiveness of dogs’ ability to detect COVID-19 comes down to their noses.

Click to play video: 'Study: Sniffer dogs can detect COVID-19 instantly'

“The nose is not like humans,” Simon said. “It’s massively different, orders of magnitude different, and they can detect things without us being able to smell them.” 

Humans have about five to six million olfactory receptors in their noses, while dogs have hundreds of millions. One-third of their brain is devoted to the interpretation of smell — something only five per cent of a human’s brain is committed to, according to Dickey’s review.

The study found dogs’ noses may even be able to detect pre-symptomatic COVID-19 cases, or even those who will develop symptoms later.

Dickey told us in an interview that this could help limit or stop the virus from spreading.

“The longer the wait is between your test and your result, that’s a latent period,” he said. “During that time you’re running around spreading COVID and you don’t know it. The dogs with a direct sniff will be done in seconds.”

Many of the studies conducted, including the work at VCH through the Canine for Care program, have shown dogs’ ability to detect the disease correctly with a success rate of more than 90 per cent. Additionally, the studies also showed a high speed at which the dogs could identify cases. In one study in  Thailand, researchers reported the dogs had gone through thousands of samples in just a few weeks.

“The dogs take only one to two seconds to detect the virus per sample. Once they detect a patient, they will sit down,” said Chulalongkorn University professor Kaywalee Chatdarong, who led the 2021 project.  “This takes only one to two seconds. Within one minute, they can manage to go through 60 samples.”

Even though the research suggested deploying scent-detection dogs could also be less expensive than rapid or PCR tests, Charles cautioned the logistics that go into training the dog is where it becomes “more prohibitive.”

Click to play video: 'Dogs trained to detect COVID-19 in Vancouver hospitals'

In VCH’s case, training of the dogs included the medical microbiology lab to provide samples for use, working with infection prevention teams and control nurses, and if a dog identifies an area of concern, cleaning services may need to be utilized. And when it comes to rolling out testing using the dogs, enough staffing is needed for mass screening.

Despite this, while Charles says deploying the dogs widely could be difficult due to staffing and training, they are still one of several tools that can be used in COVID-19 detection.

“I think the way to see those dogs from my perspective is really like another tool in the toolbox and trying to prevent further transmission of pathogen of concern,” she said.

Dickey and Junqueira say dogs should have a place in “serious diagnostic methodology” including in helping should the world face a future pandemic.

Sales Assistant Insults My Wife—You Won’t Believe the Revenge I Got Days Later

Recently, my lovely wife decided to turn her love for fashion into a career. She started looking for jobs in retail, thinking it would be a perfect match for her interests.

One afternoon, she came home upset and told me what had happened. Emma explained that earlier that day, she had gone to the shopping center.

While walking around, she noticed a popular lingerie store with a “Now Hiring” sign in the window.

She shared how her excitement quickly faded when she approached the sales assistant to ask about the job.

The rude woman didn’t even look at my wife until she was standing right in front of her. Despite feeling a bit discouraged, Emma still asked about the application process with enthusiasm. Instead of answering kindly, the assistant gave her a nasty look and said:

When Emma got home, she was in tears, heartbroken by the cruel remark. I had never seen her so devastated before, and it shattered me to see her like that.

Over the next few days, I came up with a plan. I called my friend Mike, who works in the fashion industry, and told him what had happened. Mike was eager to help.

“That’s unbelievable,” Mike said on the phone. “I’ll help you out. Let’s give her a taste of her own medicine.” A few days later, I got ready and went back to the lingerie store with Emma’s help.

I made sure the same sales assistant was working that day. I started browsing the aisles, waiting for the right moment. When the store was quiet, I approached the assistant with a friendly smile.

“Hello, I’m looking for something special for my wife. Can you help me?” I asked. Her attitude changed immediately when she saw a potential sale. She became very helpful and started showing me different items.

“Of course, sir! We have a fantastic selection. What’s the occasion?” she asked sweetly. “Just a surprise for my wife. I want to get her something really special,” I replied, acting thoughtful.

How about this piece? It’s one of our bestsellers,” she suggested, holding up a delicate lace set. “Do you think this would look good on her?” I asked, examining the lingerie. “Oh, definitely! It’s one of our top items. She’ll love it,” she assured me.

“Can you show me a few more options? I want to make sure I get the perfect one,” I said, keeping her engaged. As she showed me more pieces, I made small talk to keep her interested. “How long have you worked here?” I asked.

“About six months,” she replied. “It’s a great job if you have the right look for it.” I nodded, pretending to be interested. “Do they hire often?”

“Only when they really need someone. They’re picky about who they hire,” she said with a touch of pride.

I wrapped my arms around her, trying to comfort her. “My love, don’t listen to her. You’re beautiful and talented, and you’re worth so much more than her words,” I told her softly. “But why would she say that?” Emma sobbed. “I just wanted to apply for a job. I didn’t deserve that.”

“She’s small-minded, my angel,” I said, trying to console her. Seeing her so sad made me FURIOUS! No one should ever treat my wife like that and think they can get away with it!

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