Health & Medical

A cat with asthma crouches low, extends its neck forward, and produces a dry, retching cough that ends with nothing coming up. Owners watch this for months, sometimes years, and record it as hairballs. They mention it to the vet as an aside. Meanwhile the airways are quietly remodelling.

The distinction is worth learning, because it changes the outcome. A hairball episode ends with a hairball. Asthma ends with a cat standing there, breathing hard, looking mildly embarrassed, and nothing on the carpet.

What is happening in the lungs

Feline asthma is an allergic airway disease. The immune system overreacts to something inhaled, and the small airways respond in three ways at once: the smooth muscle around them constricts, the lining swells with inflammation, and mucus production increases. The result is a narrowed tube that the cat has to force air through, and because narrowing affects exhalation most, cats with asthma struggle to breathe out rather than in.

Somewhere between one and five percent of cats are affected, which makes it reasonably common. It often appears in young to middle-aged cats, between two and eight years old, and Siamese and other Oriental breeds may be over-represented.

Over time, chronic inflammation causes permanent changes to airway walls. That is why early diagnosis matters more than the severity of any single episode.

What it looks like at home

The classic cough is the one described above: crouched posture, neck extended, elbows out, a series of dry hacking coughs. Many owners film it on their phones, and honestly, that video is one of the most useful things you can bring to a veterinary appointment.

Wheezing may be audible, a high whistling sound on the out-breath. Some cats breathe faster than normal at rest; a resting respiratory rate above about 30 breaths per minute in a sleeping cat is worth reporting. Exercise intolerance shows as a cat that plays for a shorter time or stops to catch its breath.

In a severe attack, the cat breathes with its mouth open, which is always abnormal in a cat and always an emergency. Gums may look grey or blue. The abdomen visibly heaves with each breath. This is a get in the car now situation, not a wait until morning one.

Between episodes, many asthmatic cats appear entirely normal, which is part of why the condition gets dismissed.

Common triggers

Dusty clay cat litter is a frequent culprit, and switching to a low-dust or paper-based litter is one of the simplest interventions available. Cigarette smoke is a major trigger, and there is no safe level of it around an asthmatic cat.

Others include aerosol sprays, air fresheners, scented candles, incense, perfume, cleaning product fumes, dust from vacuuming, mould, pollen, and dust mites. Fireplace and wood stove smoke matters too. Some cats react to seasonal allergens and are dramatically worse in spring.

Working out your cat's specific triggers is often trial and error. Keeping a simple diary of episodes alongside what happened that day frequently reveals a pattern within a couple of months.

How it gets diagnosed

Chest X-rays are the mainstay, typically showing a bronchial pattern that radiologists describe as doughnuts and tramlines, caused by thickened airway walls. Some asthmatic cats have normal X-rays between attacks, so a clear image does not rule it out.

Bloodwork may show elevated eosinophils, a type of white cell associated with allergy and parasites. Faecal testing is important to rule out lungworm, which mimics asthma closely and is treated completely differently. Heartworm testing matters in regions where it is present, since heartworm-associated respiratory disease looks similar.

Airway sampling, either a tracheal wash or bronchoalveolar lavage under anaesthetic, gives the clearest picture by collecting cells and fluid from the airways. It is not always necessary but is valuable in difficult cases.

The main conditions to distinguish are chronic bronchitis, heart disease, pneumonia, lungworm and, in older cats, lung tumours. Do not accept a cough in a cat as unimportant simply because the cat seems fine otherwise.

Treatment has genuinely improved

Two drug types do the work. Corticosteroids reduce airway inflammation and form the backbone of long-term control. Bronchodilators relax the airway muscle and provide rapid relief during an attack, but they do nothing about inflammation, so they are a rescue tool rather than a treatment.

For years the only practical option was oral or injected steroids, which control the disease but carry systemic effects including diabetes risk, especially in overweight cats. The shift to inhaled medication has changed things substantially.

Cats can and do use inhalers, delivered through a spacer chamber with a small face mask. The cat wears the mask for around ten breaths while the medication is drawn in. Inhaled fluticasone delivers steroid directly to the lungs with far less systemic absorption, and inhaled salbutamol acts as the rescue bronchodilator.

The obvious question is whether a cat will tolerate a mask on its face. Most will, with proper introduction. Start by letting the cat sniff the chamber, then hold it near the face for a second with a treat, then briefly place it, building up over one to two weeks before adding medication. Cats trained gradually often end up completely relaxed about it, and owners are usually surprised.

Severe attacks need veterinary oxygen therapy, injectable steroids and bronchodilators, and sometimes a stay in an oxygen cage.

Managing the household

Environmental control is half the treatment. Switch to dust-free litter. Ban smoking indoors entirely. Stop using aerosols, plug-in fresheners and scented candles. Run a HEPA air purifier in the rooms the cat uses most. Vacuum when the cat is elsewhere, and use a machine with good filtration. Wash bedding weekly in hot water. Keep humidity moderate to discourage mould and dust mites.

Keep the cat lean. Excess weight restricts chest expansion and worsens breathing measurably.

Learn to count a resting respiratory rate. Watch the chest rise and fall for fifteen seconds while the cat sleeps and multiply by four. Knowing your cat's normal number means you spot a change days before it becomes a crisis, and that single habit has probably saved more asthmatic cats than any medication.

Asthma is not curable, but well-managed cats live long, comfortable lives with occasional flare-ups. The owners who do best are the ones who stopped calling it a hairball.