Inhalant Allergies in Cats

Inhalant allergies in cats are the most common allergy our feline friends suffer from. Inhalant allergy means that your cat is allergic to certain airborne particles.

inhalant allergies in cats

There are many such particles: animal dander, dust mites, fungi, mildew, molds, pollens (trees, weeds and other plants)… Household chemicals are also one major cause of inhalant allergies in cats: sprays, cleaners and powders, toilet cleaners (for example chlorine), different kinds of deodorizers and aerosols. Even scented soaps and potpourri can cause symptoms (something you wouldn’t first think about).

Smoke is also bad for cats. This includes tobacco smoke, of course, but also candles (especially scented ones) and fireplace smoke (it contains micro particles that are harmful to respiratory system).

Perfumes can also cause inhalant allergy. They can also cause allergy symptoms in people too, so it is polite to use them sparingly.

Cat litter is often the culprit of inhalant allergy– I know that when I pour new cat litter (clumping clay litter) into the litter box, no matter how carefully I do it, some dust rises into the air - the same happens when I clean the litterbox. To avoid this there are litter boxes that clean themselves which helps to minimize the amount of litter dust in the air.

So as you can see, basically cats can be allergic to all the same stuff as people.

Usually a cat develops inhalant allergy around 1-2 years of age, whereas other allergies tend to start at a later age (2-3 years of age). The symptoms start slowly when the body begins to increase the amount of antigens (like histamine) and they tend to get worse as the cat gets older.

inhalant allergies in cats

Inhalant allergies in cats can be seasonal (like when the cat is allergic to pollen) or constant (the cat is exposed to the allergens year round – for example dust mites, mildew and mold).

How does the cat react to the airborne allergens? You would expect the cat to sneeze, and to see runny eyes and noses, like allergic people. But cats are different – as in other allergies, they react with their skin – and the reaction can be pretty severe.

The most common symptom is severe itching, especially around the face , neck and ears, but also on the chest and armpits, belly, legs and rear. And of course the poor cat tries to relieve the intolerable itch by constant grooming and may end up licking off its hair on the itchy spots – most typically the hair loss is symmetrical.

The skin easily develops miliary dermatitis – a red, crusty rash. There may be facial scabby lesions, darkening of pigmentation and even thickening of the cat’s skin. It is important to understand that once the symptoms star, the cat needs to be taken to the vet as soon as possible. If these skin problems are left untreated, and the cat continues to groom itself excessively (and it will), this may cause secondary skin infections. Bacteria gets into the broken skin and if this happens, antibiotics have to be used and the whole process of healing becomes more difficult.

Of course the cat may sneeze too, but often this may be a symptom of the actual physical irritation caused by pollen – at times there can be so much of it in the ear it literally clogs the nasal tract (for example pines can puff of such clouds of pollen it makes everyone sneeze).

If, however, there is clear discharge from the nose, it can be a sign that the allergy may be more serious. But if the discharge is yellowish or green in color, it is not a sign of allergy but of a bacterial infection of the upper respiratory organs. This is a serious condition and you should quickly take your cat to the vet.

You can read about treating inhalant allergies in cats here.

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Disclaimer: This website is not intended to replace professional consultation, diagnosis, or treatment by a licensed veterinarian. If you require any veterinary related advice, contact your veterinarian promptly. Information at is exclusively of a general reference nature. Do not disregard veterinary advice or delay treatment as a result of accessing information at this site.

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