Cat Wheezing: Asthma, Hairball or Emergency? What to Do

How to tell a wheeze from a hairball hack or a purr, which breathing signs mean an emergency vet now, and what to log for the vet.

Quick answer: Take a wheezing cat to an emergency vet now if it breathes with its mouth open, keeps its neck stretched out to breathe, has a heaving belly, has pale or bluish gums, or takes more than 35 breaths a minute at rest. A first wheeze that stops needs an in-person vet the same day. A hairball hack ends with a clump coming up; an asthma cough brings little up.

This article is general information, not a diagnosis. If you think your pet is in danger, go to the nearest emergency animal hospital.

When is a wheezing cat an emergency?

A wheezing cat that breathes with its mouth open or pants, has a belly that heaves with each breath, breathes with its neck stretched out, has pale, gray or bluish gums, takes more than 35 breaths a minute at rest, cannot settle or collapses needs an emergency vet now. The Cornell Feline Health Center warns that cats hide breathing trouble well. Check gums only if the cat allows it.

Also go to an emergency vet now, not a video call, for:

• Sudden weakness, or hiding in a spot the cat never uses.
• Sudden back-leg weakness or paralysis, crying in pain or cold back paws, which can mean a heart-related blood clot.
• A harsh, high-pitched noise on the in-breath that is new, loud or comes with effort.
• Choking, pawing at the mouth, or string visible in the mouth. Do not pull it.
• Coughing or wheezing after an essential oil, a diffuser, liquid potpourri, an air freshener, an aerosol spray, cleaner fumes or smoke.
• Breathing trouble after a fall, a car strike, an animal attack, a fire or heavy smoke.
• A cat with diagnosed asthma still breathing hard after its own vet's emergency plan.

After a scent, spray or smoke exposure, move the cat to fresh air and go to the ER. Call ASPCA Animal Poison Control at (888) 426-4435 (a consultation fee may apply) or Pet Poison Helpline at (855) 764-7661 (a per-incident fee applies) on the way, not instead of going.

For the trip, use a carrier with minimal handling, keep the car cool and quiet, and call the hospital on the way. Never force food, water or pills, or hold the mouth open; Cornell says stress is the last thing to cause in a cat with serious respiratory disease. Never delay leaving to film.

What does cat wheezing sound like?

A wheeze in a cat is a high-pitched whistle, usually heard as the cat breathes out, unlike the low snore of a blocked nose or the steady rumble of a purr. The Merck Manual defines wheezing as a high-pitched whistle from air moving through narrowed small airways, more common when breathing out. The Merck Veterinary Manual adds that louder noises on the in-breath, such as a harsh sound called stridor, come with upper-airway blockage. Stridor that is new, loud or comes with effort means an emergency vet now.

How to count your cat's breaths

VCA Animal Hospitals says a cat resting calmly or sleeping takes 15 to 30 breaths a minute, and a rate consistently above 30 is abnormal. Count while the cat sleeps and is not purring, for a full 60 seconds; one rise and fall of the chest is one breath. If repeat counts stay above 30 with no other sign, call a vet as soon as possible rather than waiting days. See RexVet's guide to a cat breathing fast while sleeping.

How to record an episode safely

International Cat Care advises taking a phone video of a coughing or wheezing episode to show the vet. Film only a brief cough fit, and never film instead of leaving: if the cat is breathing hard, breathing with its mouth open or has a heaving belly, leave for an emergency vet now and let a passenger film on the way. Note the date, time and length of each spell.

Is it asthma, a hairball or something else?

Asthma, hairballs, nose and throat infections, heart disease, heartworm and lung parasites can all sound alike in a cat, so the pattern and what follows the noise matter more than the sound.

Cats made up 28% of RexVet visits but 61% of visits for respiratory problems.

The Cornell Feline Health Center lists wheezing and coughing among the signs of feline asthma, and says asthma affects between 1 and 5 percent of cats. VCA Animal Hospitals and International Cat Care say owners often mistake a cough for a hairball, because a coughing cat crouches with its neck out and may gag at the end, yet little comes up. VCA notes that cats with asthma rarely have a fever, so a cough with a fever points toward infection. The Merck Veterinary Manual says sudden asthma in older cats is extremely uncommon and a chronic cough in an older cat is often pneumonia, so a new wheeze in a senior cat needs an in-person workup to rule out heart disease and pneumonia. Never wait and see with a kitten or senior cat.

What you see	Often	Next step
Cough fit, neck out, then calm	Asthma	Vet same day
Neck out, still breathing hard	Attack	ER now
Retching, then a hairball	Hairball	Vet if over once a week
Sneezing, stuffy-nose snore	Nose or throat	Vet; same day if no food 24h
Wheeze, over 35 breaths at rest	Lungs or heart	ER now
Open-mouth breathing or panting	Distress	ER now
Wheeze after smoke or spray	Irritant	Fresh air; ER now
Cough with fever, low energy	Infection	Vet same day
Back legs weak, fast breaths	Heart clot	ER now

If more than one row fits, follow the most urgent one. A first-ever wheeze or cough needs an in-person vet the same day.

RexVet's guide to a cat throwing up white foam or hairballs uses the same thresholds: more than once a week needs a prompt check, and no food for about 24 hours (sooner for kittens, seniors, overweight or diabetic cats) or repeated dry retching means an in-person vet the same day. Dry retching that does not stop means the ER now, and a cat with a hairball history that is now constipated or not eating needs an in-person vet the same day.

What does a cat asthma attack look like, and what do I do?

A cat having an asthma attack usually hunches low with its neck stretched forward while it wheezes or coughs, and a cat still breathing hard in that posture needs an emergency vet now. The Cornell Feline Health Center describes this hunched, neck-forward posture during attacks. What happens next decides what to do:

• A first cough fit lasting seconds, then calm breathing: an in-person vet the same day.
• The posture held while breathing, or hard breathing, an open mouth, a heaving belly or more than 35 breaths a minute at rest: an emergency vet now.

International Cat Care calls a suspected asthma attack an emergency: struggling to breathe, open-mouthed breathing, a rapidly moving chest and occasionally collapse mean the cat must be seen by a vet urgently. Leave instead of timing the attack. The Cornell Feline Health Center advises getting veterinary help at the first signs of breathing trouble, because an asthma attack can quickly become life-threatening.

What can make a cat wheeze at home in winter?

Smoke from fireplaces, candles and tobacco, scented sprays and air fresheners, essential oil diffusers, dusty litter and cleaning products are suspected asthma triggers for a sensitive cat, according to the Cornell Feline Health Center and VCA. Winter brings more time indoors with fires, candles and scented products, so a sensitive cat may meet these irritants more often.

Trigger	Why	Try this
Fireplace smoke	Smoke	Keep cat away
Tobacco smoke	Smoke	Smoke outside
Candles, wax melts	Smoke, scent	Remove them
Air fresheners, plug-ins	Fragrance	Unplug; remove
Oil diffusers	Oils, scent	Remove them
Dusty litter	Fine dust	Low-dust, unscented
Cleaning sprays	Fumes	Cat out of room
Hairspray, perfume	Aerosol, scent	Use away from cat
Scented laundry	Fragrance	Unscented

These are suspected triggers, and Cornell says removing them has not been proven to treat feline asthma. In most cats no trigger is ever found (iCatCare). If a cat coughs or wheezes after any of these, move it to fresh air and go to an emergency vet now; call a poison line on the way.

RexVet's guide to essential oils, diffusers and potpourri around cats and the cat section of its dog guide to air freshener gel beads and plug-ins both say that for a cat, any coughing or wheezing after a scent exposure, or any lick of oil or liquid potpourri, means an emergency vet now. The essential oils guide says only a sneeze fit that clears quickly in fresh air, in a cat that touched nothing, can be watched at home.

The CDC warns that carbon monoxide can build up indoors and poison people and animals. If people or other pets in the home also feel unwell, think carbon monoxide: get everyone, pets included, outside, call 911 from outside, and take the cat to an emergency vet. See RexVet's page on carbon monoxide poisoning in dogs and cats.

Could cat wheezing be heart disease or heartworm?

Yes: the Merck Veterinary Manual says difficulty breathing is the most common sign of heart failure in cats, and the American Heartworm Society says heartworm can cause asthma-like attacks in cats, so a vet may test for both. Merck adds that cats with heart failure are far less likely to cough than dogs, so a cat breathing hard without a cough can still have heart disease. The Cornell Feline Health Center says cats in heart failure usually breathe at a resting rate above 35 breaths a minute, and calls rapid or labored breathing a medical emergency.

The American Heartworm Society says heartworm in cats can mimic hairballs, asthma or pneumonia, the first sign can be sudden collapse, and prevention is the only protection because the dog treatment cannot be used in cats. Testing is done in person, and a negative blood test does not rule it out.

What will a vet do for a wheezing cat?

A vet working up a wheezing cat usually listens to the chest, takes chest X-rays and runs bloodwork, a fecal test and a heartworm test, sometimes with an airway sample, before diagnosing asthma. The Cornell Feline Health Center calls the asthma diagnosis "exclusionary", because lungworms, chronic bronchitis and pneumonia can look like asthma.

Cornell says treatment is usually an anti-inflammatory medicine, with or without a medicine that opens the airways, and International Cat Care describes a spacer with a face mask designed for cats. The veterinarian who examines the cat chooses the medicine.

What can I do at home today for a wheezing cat?

To cut irritants at home today, keep smoke, candles, diffusers, air fresheners and aerosol sprays away from a wheezing cat, switch to a low-dust unscented litter, and log every episode with the time, length and a short video. The Cornell Feline Health Center says avoiding irritants has not been proven to treat feline asthma, so these steps never replace a vet exam or medicine. Never give a cat a person's inhaler, cough syrup, decongestant, allergy pill or any human medicine, and never give hairball remedies for a cough.

When a video visit helps, and when it does not

A cat breathing with its mouth open, with its neck stretched out, with its belly heaving or with pale or blue gums needs an emergency vet now, not a video call.

RexVet, a nonprofit online vet service, serves pets located in Florida, New York and Virginia by video visit. A $64.99 live video visit with a licensed RexVet vet, a veterinarian licensed in your pet's state, is offered in live slots about 8 AM to 11 PM ET; an open slot is not guaranteed. Book a live video visit once an episode has ended.

A video visit fits when the spell has completely ended and the cat is breathing calmly (fewer than 30 breaths a minute asleep), eating and acting normally. It suits repeat short spells, hacking or hairballs more than once a week in an otherwise normal cat, or a trigger and home-log check-in for a cat already diagnosed in person. For a first-ever wheeze or cough, an in-person vet the same day comes first.

During the live visit, you can play the clip you recorded. The veterinarian can watch the cat breathe at rest, look at gum color and posture, and ask about smoke, scents and litter. They can help sort asthma-like spells from hairballs or a stuffy nose, set up a trigger plan, and say whether chest X-rays, a heartworm test or bloodwork are needed in person and how soon. A video visit cannot diagnose asthma or rule out heartworm disease, heart failure or pneumonia; those need an in-person exam, chest X-rays and blood tests.

A video visit does not fit, and the cat needs an in-person emergency vet now, for an episode happening now, open-mouth breathing or panting of any kind, a heaving belly, a neck-out crouch with hard breathing, pale or blue gums, more than 35 breaths a minute at rest, collapse, sudden back-leg weakness, wheezing after a scent or smoke exposure, or people or other pets in the home also feeling unwell (get everyone outside and call 911).

No prescription is promised. Asthma care usually starts with an in-person exam and chest X-rays. Many airway medicines used in cats, including the usual inhalers, are human-labeled, and federal rules (21 CFR 530.3) tie human-drug and off-label use to an in-person exam in every state. In Florida, a prescription based only on a video visit must be an FDA-approved animal drug used as labeled, can cover up to 14 days and cannot be renewed without an in-person exam. Virginia lets the exam be electronic, but the federal rule still applies. New York's rules for prescribing after a video-only visit are unsettled. RexVet is not a pharmacy; a pharmacy transfer fee applies when RexVet sends a prescription to an outside pharmacy.

Eye problems were the top specific concern in RexVet cat visits (17%), ahead of urinary health and breathing problems.

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Frequently Asked Questions

How can I tell if my cat is wheezing or just purring?

A purr is a steady low rumble; a wheeze is a high-pitched whistle, usually heard as the cat breathes out. Sick cats purr too, so purring is no all-clear. VCA says not to count breaths while a cat purrs. Open-mouth breathing, a heaving belly or pale gums means an emergency vet now, whatever the sound.

Can a hairball make a cat wheeze?

Not usually. The Cornell Feline Health Center says a hairball episode is a moment or two of retching that brings up a damp clump, and that frequent hacking may be asthma instead. Hacking more than once a week in an otherwise normal cat needs a prompt vet check.

Can cats have asthma attacks at night?

Yes. The Cornell Feline Health Center notes that attacks can begin while a cat is at rest or at play. A cat that wakes breathing with its mouth open, a heaving belly or its neck stretched out needs an emergency vet now.

Can an air freshener or a candle make my cat wheeze?

Yes. The Cornell Feline Health Center lists candle smoke and aerosol sprays among suspected asthma triggers, and VCA adds air fresheners and diffusers. A cat that coughs or wheezes after one needs fresh air and an emergency vet now; call a poison line on the way, not instead of going.

Do cats outgrow asthma?

No. The Cornell Feline Health Center says cats can never be truly cured of asthma but can live happily for years with monitoring and medicine, and International Cat Care says most cats need lifelong treatment.

Is cat wheezing contagious to my other cats?

Asthma is not contagious, but infections that cause sneezing, congestion or pneumonia can spread between cats. The Cornell Feline Health Center calls the germs behind feline respiratory infections highly contagious. A cough with fever or no food for about 24 hours needs an in-person vet the same day.

My cat was wheezing but is acting normal now. Does it still need to see a vet?

Yes. A first wheeze or cough needs an in-person vet the same day, even if the cat seems fine, because cats hide breathing problems well. VCA says a heartworm test should be performed on any coughing cat. Bring a 60-second sleeping breath count and any video.

Can an online vet tell if my cat has asthma in Florida, New York or Virginia?

No, not on video alone: diagnosing asthma needs an in-person exam and chest X-rays, but video can help plan next steps for a calm cat. For a cat located in Florida, New York or Virginia, the veterinarian can watch it breathe, see the clip you play during the live visit, and say which in-person tests are needed. If medicine comes up, Florida limits video-only prescriptions to FDA-approved animal drugs used as labeled for up to 14 days with no renewal, federal rules require an in-person exam for the human-labeled inhalers usually used, Virginia's electronic-exam rule does not change that, and New York's rules are unsettled. No prescription is promised.