In this article

1. Where dog allergen really comes from
2. What happened when scientists measured the dogs
3. What 173 American homes showed
4. Why one dog sets you off and another does not
5. Living with a dog when someone is allergic
6. Before a new dog comes home
7. When to talk to your GP

Scroll through puppy adverts and one word keeps turning up: hypoallergenic. Certain breeds, poodles and Labradoodles among them, are described and marketed that way because of anecdotal reports that people with a dog allergy cope better with them¹. If someone in your family sneezes, wheezes or itches around dogs, it is a hopeful word to read.

The trouble is how little science stands behind it. NHS Scotland's children's allergy network calls the idea popular but "not based in much science"², and when researchers measured the main dog allergen on dogs and in their homes, the breeds sold as allergy-friendly did not come out ahead^{1, 3}. Here is what they found, why one dog can bother someone when another does not, and what helps at home.

Where dog allergen really comes from

Most people picture dog hair as the problem, which is understandable when it is the thing you find on the sofa. But an allergy is a reaction to proteins. Allergy UK explains that pet allergy is caused by proteins in a pet's saliva, urine or dander, the tiny flakes of skin animals shed, and that the dander, not the hair, is mainly responsible for symptoms⁵.

Hair still matters, because it spreads dander around, and it can carry pollen, house dust mite and mould too⁵. Dogs also groom themselves, putting saliva allergens on their skin that end up around the home or on your hands when you stroke them⁶. That is why PDSA says even hairless breeds, such as the Chinese crested, are not hypoallergenic⁶.

Nor is there one single allergen. Eight dog allergens are officially recognised, Can f 1 to Can f 8, and unlike cats, dogs have no single dominant one: most people who test positive to dog test positive to more than one of them⁴. The breed studies measured Can f 1, the major dog allergen¹, and when the first of them were done it was the only dog allergen there was a test for⁴.

What happened when scientists measured the dogs

A team at Utrecht University in the Netherlands put the label to the test. They took hair and coat samples from 196 dogs of four breeds sold as hypoallergenic (Labradoodles, poodles, Spanish water dogs and Airedale terriers) and from 160 other dogs, Labradors and a control group, and sampled settled floor dust and airborne dust in the dogs' homes¹.

The dogs sold as hypoallergenic had significantly more Can f 1 in their hair and coats¹. In the hair samples they averaged 2.26 micrograms per gram against 0.77 for the other dogs, nearly three times as much¹. And the differences between breeds were small compared with the variation between dogs of the same breed¹.

The researchers also measured the homes, and the extra allergen on those coats did not lead to more of it there¹. Airborne levels did not differ between breeds, and settled floor dust was lower only in Labradoodle homes, the one result that went the label's way¹. They concluded there is no evidence for calling certain breeds hypoallergenic¹.

What 173 American homes showed

A team at the Henry Ford Health System in Detroit came at the question from the home end. In families followed from pregnancy, they tested dust from the floor of the baby's bedroom a month after the birth, in homes with one dog³.

The four definitions ranged from breeds named as hypoallergenic by at least a quarter of the websites the team checked to the American Kennel Club's own list³. A Labradoodle, for instance, counted as hypoallergenic under two of them, was left out of a third and counted as an ordinary dog under the fourth³. Under none of the four did homes with hypoallergenic dogs differ from other homes³.

The authors advised doctors to tell patients they cannot rely on so-called hypoallergenic breeds to spread less allergen around them³. They noted the limits: one room was tested, breeds were as the mothers reported them, and there were too few dogs to compare single breeds³. A 2024 review of the research reached the same verdict⁴.

Why one dog sets you off and another does not

None of this means every dog affects an allergic person in the same way. NHS Scotland says you can be worse with some dogs than with others, but that this is often as much to do with how often and how well the dog is groomed as with its breed². People can also react less to an animal they are in regular contact with².

PDSA puts it this way: a breed one person tolerates well can cause problems for another, and allergen levels vary between individual pets, whatever the breed or coat length, though breeds that shed more may release more allergen into the home⁶.

Some of those differences have been measured. In a French study of 288 dogs, Can f 1 on the fur varied widely. Labradors carried the least and poodles and Yorkshire terriers the most, though only the Labradors stood apart statistically. Males carried more than females, dogs with the skin condition seborrhoea carried more, and hair length made no difference⁷.

You may hear	What the evidence says
It doesn't shed, so it won't trigger allergies	Allergen is in dander and saliva as well as hair5
Poodles and doodles carry less allergen	Four breeds sold as hypoallergenic carried more on their coats in a Dutch study1
A short or curly coat is the answer	Allergen varies between individual dogs, whatever the breed or coat length6
A hairless dog will be fine	Even hairless breeds are not hypoallergenic6
A small dog means less allergen	In the Detroit homes, a dog's weight did not appear to make much difference3

Living with a dog when someone is allergic

If you already share a home with a dog and an allergy, or plan to, the aim is to keep allergen away from the places where the allergic person spends most time, above all where they sleep. Allergy UK says a combination of measures may help to reduce symptoms⁵.

What about bathing? In a Manchester study, washing 25 dogs cut the Can f 1 that could be recovered from their clipped hair by 84%, and from their dander by 86%⁸. It did not last: in 16 dogs sampled daily, hair levels were no different from before the wash by the third day, and the researchers concluded that a dog would need washing at least twice a week⁸.

In the five homes where the air was sampled, airborne allergen fell by less, a reduction the authors called modest⁸. PDSA, for its part, advises against bathing as an allergy measure and warns that excessive bathing can strip the natural oils from a dog's coat, making the skin dry and itchy⁶. If you would like to try regular baths, ask your vet how often your dog's skin can cope and which shampoo to use.

Before a new dog comes home

If nobody in the family has symptoms, an allergy test will not settle the question. Allergy UK says testing before getting a pet is unhelpful for people without symptoms, because later exposure may still lead to an allergy⁵. NHS Scotland adds that allergy testing for pets will rarely be reliable enough to predict that a new pet will not cause any problems².

If a child is already allergic to animals, NHS Scotland's children's allergy network starts its advice on avoiding allergens with five words: don't buy a new pet². For other families, the evidence points away from the breed label and towards the individual dog and person⁶. If you are still weighing it up, a few steps help.

1. Talk to your GP first if anyone has symptoms around animals, especially with asthma, rhinitis or eczema⁵.
2. Meet the actual dog more than once and for a good while, with the allergic person there.
3. Plan dog-free zones before the dog arrives, starting with the bedroom⁵.
4. Ask what happens if it does not work out, whether you are talking to a breeder or a rescue.

When to talk to your GP

See your GP if you or your child sneeze, cough, wheeze or get itchy eyes or a rash around dogs, especially if there is asthma, rhinitis or eczema too⁵. They may refer you for a blood test or skin prick test, or to an allergy specialist, and can advise on treatment⁵. Reactions can be mild, moderate or severe, depending on how sensitive the person is and how much they are exposed⁵.

No advert can promise a dog that suits an allergy, whatever the breed. What you can do is find out a great deal before you commit, starting with an afternoon spent with the actual dog and the person who sneezes.

Sources and further reading8 sources

The small numbers in the article link to the source behind each fact. Sources open on their own websites.

1. Can f 1 levels in hair and homes of different dog breeds: lack of evidence to describe any dog breed as hypoallergenicJournal of Allergy and Clinical Immunology
2. Animal DanderChildren and Young People's Allergy Network Scotland (NHS Scotland)
3. Dog allergen levels in homes with hypoallergenic compared with nonhypoallergenic dogsAmerican Journal of Rhinology & Allergy
4. Hypoallergenic animals: A promise of hope for allergic patients?Allergologie Select
5. Pet AllergyAllergy UK
6. Hypoallergenic pets: myths and factsPDSA
7. Dog factor differences in Can f 1 allergen productionAllergy
8. Washing the dog reduces dog allergen levels, but the dog needs to be washed twice a weekJournal of Allergy and Clinical Immunology