Pneumonia in Cats: Symptoms, Causes, and Survival

Name: Pneumonia in Cats: Symptoms, Causes, and Survival
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Pneumonia in cats symptoms often start with a cough, fast or noisy breathing, and a cat that suddenly stops eating. It is an inflammation of the deep lung tissue that makes it hard for oxygen to reach the blood, and it can range from mild to life threatening [1][2]. Cats with pneumonia need veterinary care, because the cause and the severity both shape the treatment plan.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Call your vet the same day if your cat is coughing, breathing faster than usual, or has lost interest in food.
Go to an emergency clinic now if your cat is open-mouth breathing, gasping, or has blue or gray gums.
Pneumonia is confirmed with chest X-rays plus blood work and sometimes airway sampling, not by symptoms alone [2].
The most common trigger is a viral infection of the lower airways, often feline calicivirus, which then opens the door to bacteria [1].
Survival depends on the cause, how quickly treatment starts, and whether your cat has another lung disease such as asthma.

What Pneumonia in Cats Actually Is

Pneumonia is inflammation of the pulmonary parenchyma, which means the small airways, the tissue between them, and the tiny air sacs called alveoli [2]. When those air sacs fill with fluid, pus, or inflammatory cells, oxygen has a harder time crossing into the bloodstream. That is why a cat with pneumonia breathes fast, breathes hard, or both.

This is different from a simple upper respiratory infection, which mostly affects the nose, throat, and windpipe. A cat can have a mild cold for a week and never develop pneumonia. But when the infection or irritation moves deeper into the lungs, the illness becomes more serious.

Veterinarians group pneumonia by cause. Viral, bacterial, fungal, parasitic, and aspiration pneumonia all look similar to an owner but are treated differently [1][2]. Knowing which type your cat has guides everything from medication choice to how long recovery takes.

Pneumonia in Cats Symptoms: What You Will Notice First

The earliest signs are easy to miss because cats hide illness well. You may notice your cat is quieter, sleeping more, and eating less before any breathing change shows up.

Breathing changes

Faster breathing while resting
Breathing that uses the belly muscles, so the sides of the abdomen move in and out
Noisy breathing, wheezing, or a wet sound
Coughing, which in cats often sounds like a hairball attempt or a dry hack
Open-mouth breathing, which is always an emergency in cats

Coughing is a common sign of pneumonia in dogs and cats, along with fever, lethargy, and poor appetite [2]. A chronic cough can have many causes, so it helps to read about Cat Coughing: Causes and When to Seek Help before you decide how urgent things are.

Whole-body signs

Fever
Lethargy and hiding
Refusing food or dropping weight
Dehydration, with tacky gums or skin that stays tented when gently pinched
A blue or gray tint to the gums or tongue, which means oxygen levels are dangerously low

Some cats also have eye or nose discharge, sneezing, or mouth ulcers if a viral upper respiratory infection came first. If those signs are your main concern, Upper Respiratory Infection In Cats Symptoms covers that picture in more detail.

Causes and Risk Factors

The most common cause of pneumonia is a viral infection of the lower respiratory tract [1]. Feline calicivirus is a frequent culprit because it damages the airways and leaves the lung tissue vulnerable to a second infection [1]. In one reported case, a young Persian cat developed severe respiratory failure after calicivirus infection, and a kitten with a virulent calicivirus strain died with severe pneumonia confirmed on post-mortem examination [3][4].

Bacteria such as Mycoplasma and Chlamydia can cause pneumonia on their own or after a virus weakens the lungs [1]. A recent study found Mycoplasma species in 28.3 percent of cats with rhinitis compared to 5.4 percent of healthy cats, and Mycoplasma felis appeared in 21.7 percent of rhinitis cases but none of the healthy controls [5]. That does not prove those organisms caused pneumonia, but it shows how often they show up in cats with respiratory disease.

Other causes include:

Parasites such as lungworms and flukes that invade the bronchi [1]
Fungal infections [1]
Protozoa such as Toxoplasma gondii [1]
Inhaled irritants that injure the airway lining and invite bacterial infection [1]
Aspiration of vomit, food, or improperly given liquid medication [1][2]

Aspiration pneumonia deserves special attention. It can follow persistent vomiting, force feeding, or medication given the wrong way, and it can happen in newborn kittens with a cleft palate that aspirate milk while nursing [1].

Cats with asthma

Asthma and pneumonia can coexist, and that combination makes diagnosis harder. Asthma causes chronic airway inflammation and coughing, and a cat with asthma may already have a cough that owners have learned to live with. When pneumonia develops on top of that, the change can be subtle at first.

Steroid treatment for asthma can also mask or worsen an infection, because steroids suppress the immune response. If your asthmatic cat suddenly coughs more, breathes harder, or stops eating, that is a reason to call your vet instead of adjust inhalers on your own.

How Veterinarians Diagnose Pneumonia

Diagnosis is based on history, clinical signs, chest X-rays, and other laboratory testing [2]. Your vet will ask when signs started, whether your cat vomited recently, what medications you have given, and whether other cats in the home are sick.

Physical exam

Your vet listens to the lungs, counts the breathing rate, checks gum color, takes a temperature, and assesses hydration. Cats with pneumonia often breathe faster than normal even in a quiet exam room.

Pneumonia in cats X-ray findings

Chest X-rays are the main imaging step. On a radiograph, pneumonia usually appears as abnormal cloudiness or a bronchial pattern in the lung fields, and the pattern can hint at whether the problem is viral, bacterial, or aspiration related [2][6]. X-rays also help rule out other causes of breathing trouble, such as a mass, fluid around the lungs, or tracheal narrowing [6].

X-rays cannot identify the exact organism, so they are paired with other tests.

Lab work and airway sampling

Blood work checks for infection, inflammation, and organ function
Airway sampling, sometimes with a wash or swab, can identify bacteria and guide antibiotic choice [7]
PCR testing can detect viruses such as calicivirus and organisms such as Mycoplasma [3][5]
In severe cases, oxygen levels are measured directly

Advanced tools such as computed tomography, fluoroscopy, and bronchoscopy are sometimes used when the diagnosis is unclear or the cat is not improving [7].

Test	What it shows	Why it matters
Chest X-rays	Lung patterns, fluid, masses	Confirms pneumonia and rules out other causes [2][6]
Blood work	Infection, inflammation, organ health	Guides treatment and monitors safety
Airway sampling	Bacteria and cell types	Helps pick the right antibiotic [7]
PCR testing	Viruses and organisms	Identifies calicivirus, Mycoplasma, and others [3][5]
Oxygen measurement	Blood oxygen level	Shows how severe the breathing problem is

Treatment Options

Treatment is supportive care, including oxygen when needed, plus antimicrobial therapy if a bacterial infection is suspected [2]. Your vet will tailor the plan to your cat's specific cause and condition.

Oxygen and breathing support

Cats in respiratory distress often need oxygen in an oxygen cage, mask, or nasal line. Severe cases may need mechanical ventilation, as in the calicivirus case where a cat required a ventilator for breathing failure [3]. That level of care happens at a specialty hospital.

Medications

Antibiotics for suspected or confirmed bacterial infection, chosen based on sampling when possible [2][7]
Antiviral or antifungal drugs when the cause calls for them
Bronchodilators and anti-inflammatory drugs, which are commonly used for chronic cough and airway disease [7]
Anti-tussives in selected cases, though suppressing cough is not always helpful [7]

Your veterinarian calculates every dose from your cat's weight and health status. Never give human cough or cold medicine to a cat.

Support at home

Keep your cat warm, quiet, and away from other pets
Offer highly palatable wet food and warm water
Use a humidifier or run a steamy shower to ease airway irritation
Give every medication exactly as prescribed and finish the full course

Nebulization and gentle coupage (cupping your hand and patting the chest) are sometimes taught by vets to help clear secretions. Ask your vet to show you the correct technique before trying it.

Recovery, Outlook, and Long-Term Management

Most cats with uncomplicated pneumonia improve within several days of starting treatment, but full recovery can take weeks. The prognosis depends on the cause, the cat's age, any underlying disease, and how quickly care began.

Pneumonia in cats prognosis

Cats with mild bacterial or viral pneumonia that get prompt treatment generally do well. Cats with severe aspiration pneumonia, fungal infection, or respiratory failure have a guarded outlook. In one report, a cat with calicivirus pneumonia and acute respiratory distress syndrome survived ten days on a ventilator but died later from airway complications [3]. That case shows both how far treatment can go and how serious severe pneumonia can be.

Pneumonia in cats survival rate

There is no single survival rate that applies to every cat. Outcome varies widely with the cause and the severity of illness, and some pneumonia cases are fatal, especially in free-roaming cats with underlying disease [8]. Your vet can give you a more realistic estimate after seeing the X-rays and lab results.

Living with a cat that has had pneumonia

Recheck X-rays may be needed to confirm the lungs have cleared
Cats with asthma may need long-term inhaled or oral medication
Keep your cat indoors and away from sick cats
Watch for a return of coughing or fast breathing, which can signal a relapse

If your cat also has urinary signs, such as straining or frequent trips to the litter box, that is a separate problem. Symptoms Of Urinary Tract Infection In A Cat explains what those signs mean.

Prevention

You cannot prevent every case of pneumonia, but you can lower the risk.

Keep vaccinations current, especially against calicivirus and other respiratory viruses
Limit contact with unknown or sick cats, since calicivirus spreads easily in multi-cat settings [4]
Never force feed or give liquid medication unless your vet has shown you how
Treat vomiting and regurgitation promptly to reduce aspiration risk [1]
Manage asthma and other chronic airway disease consistently
Keep kittens and senior cats warm, well fed, and stress free

Limitations and When to Contact a Veterinarian

No article can tell you how sick your individual cat is. Only a veterinarian who examines your cat can do that.

Call your veterinarian the same day if your cat:

Coughs repeatedly or has a new cough
Breathes faster than normal while resting
Refuses food for more than 24 hours
Has a fever, is hiding, or seems weak

Go to an emergency clinic right away if your cat:

Breathes with an open mouth
Gaspes or stretches the neck out to breathe
Has blue, gray, or pale gums
Collapses or cannot stand

Schedule a routine visit if your cat has a lingering cough that comes and goes, or if you are managing asthma and something has changed. Early treatment is almost always easier than waiting.

Frequently Asked Questions

Can a cat survive pneumonia?

Yes, many cats survive pneumonia with prompt veterinary treatment. Mild cases often improve within days of starting antibiotics and supportive care, while severe cases involving respiratory failure carry a much higher risk. The earlier you seek care, the better the odds.

Is pneumonia in cats contagious to other cats?

Some causes are contagious and some are not. Viral causes such as calicivirus spread easily between cats, especially in shelters and multi-cat homes, while aspiration pneumonia from vomiting is not contagious at all. Keep a sick cat separated from others until your vet clears them.

How long does pneumonia last in cats?

Mild cases may improve within several days, but complete recovery often takes two to four weeks or longer. Severe cases can require hospitalization and extended follow-up. Your vet will decide when to recheck the lungs.

Can pneumonia in cats be mistaken for asthma?

Yes, the two can look alike because both cause coughing and fast breathing. Asthma tends to be chronic and reversible with bronchodilators, while pneumonia usually comes with fever, lethargy, and appetite loss. Chest X-rays and lab work help tell them apart.

Can I treat my cat's pneumonia at home?

No, pneumonia needs a veterinary diagnosis and prescription medication. Home care such as warmth, good nutrition, and humidity can support recovery, but it cannot replace oxygen therapy, antibiotics, or other treatment your cat may need.

References

Pneumonia in Cats - Cat Owners. Merck Veterinary Manual.
Pneumonia in Dogs and Cats - Respiratory System. Merck Veterinary Manual.
Administration of porcine surfactant in the treatment of a fatal case of acute respiratory distress syndrome in a cat with calicivirus pneumonia. JFMS open reports, 2026.
Description of a Virulent Systemic Feline Calicivirus Infection in a Kitten with Footpads Oedema and Fatal Pneumonia. Pathogens (Basel, Switzerland), 2025.
EXPRESS: Detection of Mycoplasma species and respiratory pathogens in cats with rhinitis and healthy cats. Journal of feline medicine and surgery, 2026.
Tracheal Squamous Cell Carcinoma in an Adult Cat. Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association, 2026.
The Approach to Chronic Cough in Dogs and Cats. The Veterinary clinics of North America. Small animal practice, 2026.
Morphological patterns of pneumonia in free-roaming cats: a necropsy and histopathological study. Frontiers in veterinary science, 2026.