Cat Cough vs Asthma: Hairball, Bronchitis or Heart Failure

Most cats that cough do not have asthma, and most asthmatic cats are not coughing when they are carried into the clinic. Two numbers decide the next step: the resting breathing rate and the colour of the gums. A cat breathing over 40 times a minute while asleep, or one with grey or blue gums, needs to be seen within the hour.

When a cough is an emergency

Count breaths with the cat asleep, watching the chest for a full 30 seconds and doubling it. Under 30 is normal, 30 to 40 earns a same-day call, above 40 at rest is an emergency. Add any of these and skip the call: open-mouth breathing (cats do not pant unless something is badly wrong), neck stretched forward with elbows turned out, flaring nostrils, gums going grey or blue, or a cat that has stopped eating and is hiding. A severe attack can close the airway in under 10 minutes.

Telling a cough from a hairball

Posture is the giveaway. A hairball produces a hunched, rhythmic retching sequence that ends with a tube of hair on the floor, typically once every 1 to 3 weeks in a long-haired cat during shedding season. A cough is a short, dry, repeated hack with the head low and neck extended, often ending in a swallow, and nothing comes up. Owners routinely describe 20 to 30 such episodes a day as hairball attempts. If a cat retches more than twice a week and nothing ever appears, treat it as a cough: malt paste will not fix it, an X-ray might.

What feline asthma looks like

Asthma is an allergic, eosinophilic inflammation of the lower airways, triggered by clay litter dust, smoke, scented candles, sprays and pollen. The typical patient is 2 to 8 years old with an intermittent dry cough, a wheeze, and laboured breathing that resolves on its own within minutes — which is exactly why owners wait months. Between episodes the cat looks normal and the stethoscope may find nothing. Some cats show only the asthma posture: sitting still, neck extended, elbows out, breathing fast and shallow, unwilling to lie flat.

The three mimics that must be excluded

Asthma is a diagnosis of exclusion. Congestive heart failure gives the same posture and the same rapid breathing, usually in an older cat with a murmur and often with fluid around the lungs; steroids make it worse, sometimes fatally. Lungworm (Aelurostrongylus abstrusus) causes a chronic soft cough in outdoor cats and shows on a fecal Baermann test. Chronic bronchitis in cats over 8 gives a daily wet cough with no eosinophils. Also consider an inhaled grass awn, laryngeal paralysis and chest tumours. Cough with weight loss means imaging before any steroid.

What the tests show, and what they miss

Start with thoracic radiographs. The classic asthmatic pattern is bronchial: thickened airway walls seen end-on as donuts and lengthwise as tram lines, with hyperinflated lungs. Roughly 20 to 30 percent of asthmatic cats have normal films, so a clean X-ray does not rule it out. Cardiac ultrasound is the fastest way to separate asthma from heart failure, and most vets scan the heart in the same visit for any cat over 8. Confirmation needs a bronchoalveolar lavage with eosinophils above about 17 percent of cells, under anaesthetic.

Inhaled steroids and the spacer

Fluticasone through a metered-dose inhaler and spacer is the standard long-term treatment: 110 to 220 micrograms twice daily, which is 1 to 2 puffs of the 110 microgram strength. The cat does not time a breath to the puff; the spacer holds the dose and the cat inhales it over 7 to 10 breaths. Budget 2 to 4 weeks of mask training, starting with the mask beside the food bowl and no puff at all. Inhaled steroids take 10 to 14 days to work, so most vets start prednisolone at 1 to 2 mg per kg daily for 2 to 3 weeks and taper it as the inhaler takes over. A cat on 5 mg of prednisolone daily for a year is heading for diabetes.

Managing an acute attack

Albuterol through the same spacer is the rescue drug: 1 puff of the 90 microgram inhaler, repeatable every 30 minutes in the first hour of a severe episode, then call the vet. It opens the airway in 5 to 10 minutes but does nothing to the inflammation, so it buys time rather than treating the disease. A cat needing rescue puffs more than twice a week is under-treated on maintenance.

Signs, causes and urgency

What you see	Likely cause	How fast
Dry hack, nothing produced	Asthma, chronic bronchitis	X-ray within 1 week
Retches, then a tube of hair	Hairball	Grooming and diet
Hunched, neck out, 40+ breaths	Attack or heart failure	Emergency, same hour
Cough plus weight loss, age 10+	Tumour, heart, lungworm	Within 48 hours

Five things to do this week

1. Count the resting breathing rate twice daily for 3 days and write it down.
2. Swap clay litter for low-dust pellets and remove aerosols, candles and smoke from the bedroom.
3. Film every coughing episode with sound, 15 seconds each.
4. For a cat over 8, get a chest X-ray and a heart scan before accepting a steroid prescription.
5. If it is asthma, start mask training now and get the inhaler working before tapering tablets.

Asthma is managed for years, not cured. The cats that do badly are the ones whose cough was filed under hairballs for a year while the airway remodelled. Sneezing and nasal discharge instead of coughing points to the upper airway, covered in cat URI symptoms; a sudden blue tongue is a breathing emergency, and outdoor cats with a soft chronic cough need the lungworm section of fleas and worms.

Frequently asked