Pneumonia in Dogs and Cats: Symptoms, Treatment and Recovery

By Dr Duncan Houston

A pet with a cough, low energy and poor appetite may have pneumonia, but some affected animals barely cough. Breathing effort and overall wellbeing are more important than how dramatic the cough sounds.

Pneumonia involves inflammation in the lungs and can interfere with oxygen exchange. The cause determines treatment, and an animal struggling to breathe should not be managed by trial and error at home.

Quick Answer

Pneumonia can cause rapid or laboured breathing, lethargy, reduced appetite and sometimes coughing or fever. Causes include infection and aspiration of food, fluid or stomach contents. Some stable patients recover at home after assessment, while others need oxygen and hospital care. Breathing distress, collapse or open-mouth breathing in a cat is an emergency.

What causes pneumonia?

Bacterial infection may follow airway injury or impaired defences. Viral infections, fungi and parasites can also contribute, with risks depending on location and exposure. Aspiration occurs when material enters the airway instead of being swallowed safely.

The Merck pneumonia review identifies vomiting, megaesophagus and improperly administered food or medication as important aspiration risks. Chemical lung injury after aspiration and bacterial infection are related but not identical, so every episode needs individual assessment.

Which signs matter most?

Affected pets may breathe faster while asleep, use their abdomen to breathe, avoid lying down or become unusually quiet. Fever may be absent, particularly early or in some severely ill patients. Cats can hide respiratory disease until it is advanced.

How is it diagnosed?

The team assesses breathing, circulation and oxygen needs before pursuing stressful tests. Chest radiographs help identify lung changes, but early disease may not yet show a clear pattern. Bloodwork and targeted infectious-disease testing provide additional information.

Airway sampling for cytology and culture can help select antibiotics when the patient is stable enough. Sampling is not always safe before initial treatment. A veterinary review of bacterial pneumonia discusses these diagnostic and treatment decisions.

What else could cause similar signs?

Heart failure, asthma, chronic bronchitis, airway collapse, lung tumours and fluid or air around the lungs are important alternatives. A respiratory rate alone cannot distinguish them. A recent regurgitation or anaesthetic event is useful history, but it does not replace examination.

What treatment is needed?

Hospital treatment may include oxygen, carefully selected fluids, nutritional support and medicines directed at the cause. Antibiotics are used when bacterial infection is suspected or confirmed; they are not a universal treatment for every type of lung inflammation.

Nebulisation and coupage may help selected patients clear secretions when prescribed and demonstrated. They are not appropriate for every cough, and struggling through them can worsen distress. Cough suppressants should not be added without veterinary advice because clearing secretions may be important.

Recovery and medication duration vary. Rechecks may include examination, blood tests or repeat imaging, scheduled according to response. Do not assume every pet needs the same number of weeks of antibiotics or weekly radiographs.

When is this an emergency?

Seek immediate care for breathing effort, inability to settle, collapse or blue-grey gums. Keep the animal calm and cool and call ahead. Do not force food, water or tablets, and do not delay transport to finish a nebuliser session.

Home recovery plan

1. Give prescribed medicines and ask what to do if vomiting prevents a dose.
2. Monitor sleeping breathing, appetite, water intake and energy each day.
3. Provide a quiet, smoke-free room and follow activity restrictions.
4. Use feeding modifications only as directed if aspiration is a concern.
5. Attend rechecks and report worsening signs sooner.
6. Follow isolation advice if a contagious respiratory infection is suspected.

Common mistakes

• Waiting for a cough before recognising respiratory illness.
• Using leftover antibiotics or human cough mixtures.
• Syringe-feeding a weak or regurgitating pet.
• Stopping treatment without the planned reassessment.

Preventing recurrence

Manage the underlying problem, such as regurgitation, swallowing dysfunction or chronic airway disease. Keep relevant vaccinations current and reduce exposure to sick animals as advised. Prevention depends on the cause; nebulisation alone cannot prevent aspiration.

Frequently asked questions

Can pneumonia occur without fever?

Yes. Normal temperature does not exclude it.

Is pneumonia contagious?

Some underlying infections are contagious; aspiration itself is not. Ask about your pet’s diagnosis.

When should breathing improve?

The trend should be reviewed with the treating vet. Worsening breathing requires immediate reassessment rather than waiting for a scheduled milestone.

Breathing comfort, an accurate cause and a clear follow-up plan are the most reliable guides through recovery.

For help understanding your animal’s care and preparing questions for your veterinarian, visit ASK A VET™. Seek in-person emergency care immediately for urgent signs.