Can Dog Allergies Be Solved by "Changing the Dog"?—Genome-Edited Beagles Question the Future of Pets

Loving Dogs but Unable to Live with Them

Holding them makes your eyes itch, petting them causes a runny nose, and in severe cases, asthma symptoms can occur. For those with dog allergies, the wish to "someday live with a dog" has often been something they had to give up due to medical constraints.

However, in 2026, a study was published that might fundamentally overturn this premise.

It's not about suppressing the human immune response with medication.

It's about changing the dog itself.

New York biotechnology company Kindred Companion Sciences used genome editing technology CRISPR-Cas9 to create two beagles that do not produce "Can f 1," one of the main substances causing dog allergies.

Their names are Alfie and Bailey.

They look like ordinary beagles.

However, their genes have small, intentional changes made by humans.

What Makes Them Different from "Low-Allergy Dogs"?

Previously, certain breeds like poodles and labradoodles have been introduced as "dogs less likely to cause allergies."

However, "less shedding" is not the same as "not producing allergens."

The cause of dog allergies is not simply the dog's hair itself. Multiple proteins found in saliva, skin, and dander are recognized by the human immune system, triggering allergic reactions mediated by IgE antibodies.

The most representative of these is Can f 1.

Studies have shown that a significant percentage of people with dog allergies react to Can f 1, while others react to different allergens like Can f 2, Can f 3, Can f 4, Can f 5, and Can f 6. In other words, "eliminating Can f 1 will free everyone from dog allergies" is not that simple.

Kindred's idea is not to reduce the causative substances through cleaning or shampooing but to prevent them from being produced in the dog's body from the start.

The research team edited beagle-derived cells with CRISPR-Cas9, introduced a single base change to the Can f 1 gene, rendering the protein unable to be produced normally.

Using these edited cells, they created embryos by combining somatic cell nuclear transfer, also known as cloning technology.

Twenty-five reconstructed embryos were implanted into surrogate dogs, resulting in the birth of two puppies.

Alfie and Bailey were born on September 22, 2024.

The Experimental Results Are Indeed Intriguing

When researchers examined the saliva, hair, and dander of the two dogs, Can f 1 was not detected within the testable range.

They also examined regular beagles, standard poodles, and goldendoodles for comparison.

Can f 1 was detected even in poodles and goldendoodles, which are generally considered "less likely to cause allergies."

This is a crucial point of the current study.

Traditional "low-allergy dogs" do not eliminate the allergens themselves. In contrast, the genome-edited dogs stop the source of at least Can f 1.

Furthermore, a skin prick test was conducted on a man with dog allergies. While skin reactions were observed with samples from regular beagles, poodles, and goldendoodles, no detectable reactions occurred with samples from Alfie and Bailey.

It is a very impressive result.

However, we must not conclude that "dog allergies have been solved" here.

The human test subject was only one person.

Moreover, this person reacted to Can f 1 but did not show reactions to other major dog allergens tested.

There is significant individual variation in dog allergies. For people who strongly react to other proteins like Can f 5, symptoms may still occur even with dogs that lack Can f 1.

The researchers themselves position this achievement not as large-scale proof of safety and efficacy but as a "proof of concept," an initial demonstration that it is technically feasible.

Even If the Two Dogs Are Healthy, It Cannot Yet Be Called "Safe"

Another major issue is the impact on the dogs themselves.

Alfie and Bailey have been continuously monitored by veterinarians, and no apparent abnormalities have been found in growth, weight, activity, or imaging tests.

The research team also conducted a genome-wide analysis and reported that no unintended edits or large-scale chromosomal rearrangements were detected in the predicted off-target regions of CRISPR.

However, it is too early to be reassured.

The exact role of the protein Can f 1 in a dog's body is not fully understood.

There might be no issues in young dogs, but effects may appear in middle to old age.

Differences might only become apparent under specific conditions like certain infections, immune responses, reproduction, or metabolism that are not evident in everyday life.

Even if no issues arise in two dogs, low-frequency side effects might be discovered when the number increases to 100 or 1,000.

In human medicine, long-term safety is not judged based on a small number of clinical cases.

When it comes to technology that creates life itself, even more caution is necessary.

Humanity Has Already "Designed" Dogs

It is interesting that the criticism "manipulating genes is unnatural" alone cannot fully explain this issue.

This is because the very existence of current dogs is the result of human selection over thousands of years.

Dogs suited for hunting.

Dogs suited for herding.

Small dogs that are easy to keep indoors.

Dogs with short legs.

Dogs with short noses.

Dogs with lots of wrinkles.

Dogs with long hair.

Humans have bred dogs with desirable traits for generations, creating the diverse breeds we have today.

The issue is that these selections have not always prioritized the health of the dogs.

Features like extremely short noses causing breathing difficulties, long bodies and short legs putting stress on the spine, protruding eyeballs, and excessive skin wrinkles can cause chronic pain or health risks for dogs, even if humans find them "cute" or "breed-typical."

Researchers from the UK's Royal Veterinary College warn that in dogs with extreme body types, the very appearance selected by humans can become an animal welfare issue.

In this light, it seems odd to single out CRISPR as a unique "intervention into nature."

Traditional breeding selects not only the desired traits but also a large number of genetic characteristics together.

In contrast, CRISPR may allow for the alteration of only the targeted genes.

In some cases, it might be a more genetically limited intervention than classical inbreeding.

Therefore, the real question to ask is not

"Is it bad because it's gene editing?"

but rather,

"Why are we changing animals, and will the animals be happy as a result?"

This is the question.

Editing to Cure Diseases vs. Editing for Human Convenience

For example, genome editing to correct mutations causing severe genetic diseases, allowing dogs to live without pain, would likely be more acceptable to many people.

But what about the current case?

If losing Can f 1 poses no health issues for the dog, the dog itself does not directly become healthier.

The primary beneficiaries are humans.

People with dog allergies can live with dogs.

It could also open up possibilities for those who need assistance or service dogs but cannot use them due to allergies.

This is by no means a small benefit.

However, the question remains whether it is acceptable to change a dog's genes simply because it is "easier for humans to keep."

Moreover, the process of creating the two dogs involved multiple animals, including those providing eggs and acting as surrogates.

The ethical evaluation should include not just the fact that two healthy dogs were born but also how many animals were needed in the process.

On Social Media, "I Want One" Clashes with "Is It Worth It?"

As this news spread, opinions were predictably divided on social media and forums.

One of the notable positive reactions on platforms like Reddit came from people with severe dog allergies.

In response to criticism like "Just adopt a rescue dog," they pointed out that for those with severe allergies, adopting a regular dog is not an option.

There were also posts from people who wanted their children to experience life with a dog but had to give up due to their own severe allergies.

For such individuals, genome-edited dogs could be a "previously unavailable option," not a luxury.

On the other hand, negative opinions remain strong.

"Is it right to customize life to suit human convenience?"

"Is there a need to create a new 'designer pet' market when there are already dogs in shelters needing families?"

"Won't commercialization lead to mass breeding like puppy mills?"

"We don't know what health issues might arise in the future."

These are some of the concerns.

Conversely, some users argue back.

Humans have already significantly altered dogs through selective breeding, including pugs and dachshunds. The idea is that manipulating only the target genes might be more rational than traditional breeding, which moves hundreds or thousands of genetic traits simultaneously.

In scientific news communities, while there are concerns about long-term health impacts, some voices also see the expanded application of CRISPR as a technological advancement.

Of course, comments on social media are not opinion polls.

A few posts cannot be treated as the opinion of society as a whole.

Still, the structure of the debate is intriguing.

"Expectations for scientific technology" and "resistance to designing life as a commodity" are almost directly clashing.

In reactions on Facebook introduced in a New York Times article, there was also sarcasm questioning why the dogs are being changed instead of the humans.

This question succinctly captures the essence of the current debate.

It's Not a Distant Issue for Japan Either

In Japan, as of 2025, the estimated number of dogs kept is about 6.82 million.

Combined with cats, the scale exceeds 15 million.

As many now consider pets not just as "companion animals" but as family and life partners, if a new option emerges for those who can't keep dogs due to allergies, it is likely to attract interest.

At the same time, there is ongoing debate in Japan about the positioning of live animal sales through pet shops and breeders versus the adoption of rescue dogs and cats.

If "genome-edited" becomes a new product value, it will make the issue even more complex.

"Low allergen"

"Less prone to illness"

"Long-lived"

"Less shedding"

"Stays small"

When it becomes technically possible, to what extent should humans be allowed to order the characteristics of dogs?

Is reducing allergies acceptable, but changing coat color not?

Is disease prevention okay, but altering physique or personality not?

Is it acceptable for service dogs but not for household pets?

Drawing the line is not easy.

New Challenges for Japan's Genome Editing System

In Japan, not all genome-edited organisms are uniformly treated as traditional "genetically modified organisms."

According to the Ministry of the Environment, organisms obtained through genome editing are subject to the Cartagena Act if nucleic acids processed outside the cell remain in the final organism.

On the other hand, types where such nucleic acids do not remain may not fall under the Cartagena Act's genetically modified organisms, but even in such cases, a system is in place to require information provision to the relevant authorities regarding the organism's characteristics and impact on biodiversity.

However, this does not mean that "genome-edited pets can be freely sold."

Animal welfare, breeding and sales, importation, biodiversity, and research ethics are among the multiple systems that may be involved.

At the very least, when products like the current ones actually circulate in Japan, there will need to be a discussion on whether "traditional pets" and "pets with traits intentionally altered by biotechnology" should be treated under the same framework.##