Cat allergy: how to live with a cat (and when not to)
Plenty of allergic people live with cats, and plenty of others have to give them back within weeks. The difference lies in knowing beforehand how allergic you are, which cat you choose and what you do at home. This is what works, and what is pure marketing.
It is not the hair
Cat allergy is caused mainly by certain proteins, and the main one is called Fel d 1. The cat produces it in its skin glands and saliva, and spreads it all over its coat as it grooms. When that hair and the flakes of skin dry out, the allergen turns into extremely fine particles that float in the air for hours, stick to clothes, sofas, curtains and walls, and travel with you to places that have never had a cat in them. That is why cat allergy is so persistent, and why switching to a shorthaired cat doesn't always fix anything: the problem is not the amount of hair, it is what the hair carries.
See an allergist first
Before getting a cat, and especially if you have already noticed symptoms around cats, book an appointment with an allergist. They will run tests to find out whether you are allergic to cats, how badly, and whether you have asthma or are at risk of it. Sneezing a bit is not the same as having asthma attacks, and the second completely changes the decision. The allergist can also assess immunotherapy, allergy shots that in some people greatly reduce symptoms over the years, as well as day-to-day treatment. Doing this after adopting is too late: what sends the most cats back to shelters is an allergy nobody checked.
Hypoallergenic cats do not exist
No cat is free of Fel d 1. What there are, are differences. Some Siberians and Balinese are said to produce less, and some Siberian breeders measure their cats' levels, but it varies enormously from cat to cat within the same breed. Sphynx cats have no hair, but they still produce the allergen in their skin and saliva. Unneutered males produce more than females and neutered males. And each person reacts differently to each cat. So the word hypoallergenic in an advert means nothing in particular. The only reliable test is spending time with that specific cat.
Try before you decide
If the allergist gives you the go-ahead, spend time with cats before adopting: long visits to homes with cats, several afternoons at the foster home of the cat you are interested in, if the rescue allows it. The reaction is not always immediate, so a ten-minute visit is not enough. Some rescues offer trial fostering, which is a good way to find out how you react to that cat in your own home over a few weeks. If you have hardly any symptoms with a particular cat, that is a good sign; if you have serious problems with every cat you try, perhaps now is not the time, and that is a good decision too.
What really helps at home
You can't get rid of the allergen, but you can reduce it a lot. Make the bedroom a cat-free zone: it is the most effective measure, because you spend eight hours breathing in there. Put an air purifier with a HEPA filter in the main rooms. Vacuum several times a week with a machine that has the same kind of filter, and smooth floors are better than rugs. Use washable covers on sofas and on the cat's sleeping spots, washed often in hot water. Wash your hands after touching the cat and don't touch your face. Air the house every day. And if possible, have someone else in the household do the brushing and the litter tray, or wear a mask.
The cat can help too
There are a few things on the cat's side that help. Neutering a male reduces allergen production, and in Spain neutering is required by law anyway. An occasional bath reduces the allergen on the coat for a few days, but most cats hate it and the effect is short-lived, so it isn't worth forcing; wiping the coat with a damp cloth is easier for them to tolerate. There is a cat food containing an egg protein that neutralises some of the Fel d 1 in the cat's saliva, and some studies have found less allergen on the coat; it can help as an extra, not as a solution. Talk to your vet before changing your cat's food.
Children, asthma and allergy
If a child in the household has asthma, the decision to get a cat should be made with their paediatrician or allergist, because cat allergens can make existing asthma worse. On the other hand, some studies suggest that children who live with cats from a very young age have a lower risk of developing allergies, although the results are not the same across all studies and it shouldn't be treated like a vaccine. The sensible approach is neither to adopt a cat to prevent allergies in a child, nor to rule out a cat out of fear when there is no problem: decide with the doctor, based on the facts.
What doesn't work
There are many products promising to put an end to cat allergy, and most have no solid evidence behind them. Sprays for the cat's coat, miracle wipes and generic supplements may reduce the allergen a little for a while, but they are no substitute for measures at home or for medical treatment. Clipping the cat's coat doesn't work either: it doesn't reduce Fel d 1 production and it takes away the cat's protection. And choosing a shorthaired cat in the belief that it will cause less allergy is a common mistake: hair is the vehicle, not the source. What really works is a combination of a proper diagnosis, treatment if needed and consistent habits.
When it doesn't work
Sometimes, despite everything, the symptoms are too severe, and the person's health comes first. If you already have the cat and there is no way to live together, don't abandon it or give it away through an online ad: talk to the rescue it came from, which usually takes the cat back under the adoption contract, or find a responsible family yourself with a rescue's help. And if you are adopting knowing you have an allergy, tell the rescue: they will help you choose a lower-risk cat and arrange a trial foster. That is much better for everyone than handing the cat back three weeks later.
Allergy is caused not by hair but by the protein Fel d 1, and no cat is free of it. See an allergist first, test with the specific cat, and at home make the bedroom cat-free, use a high-efficiency air filter and clean often. If there is asthma, decide with the doctor.
Educational content from Michipedia, translated from the Spanish original. It does not replace the advice of a vet or a feline behaviour specialist. Every cat is an individual.