What are the common causes of noncardiogenic pulmonary edema?

Noncardiogenic pulmonary edema is commonly caused by direct lung injury, inhalation injury, severe infection, or acute systemic inflammation. Your vet will need to examine your pet to determine the underlying cause.

What tests will the vet use to confirm pulmonary edema?

Common tests include chest X-rays, thoracic ultrasound, blood tests, and blood gas analysis. If needed, the vet may also collect and examine pleural or bronchoalveolar fluid for cytology and bacterial culture.

What can I do if my pet is breathing rapidly?

Keep your pet calm and quiet, film the breathing, and note when the episode started. If breathing worsens or your pet's gums turn blue, go to a vet immediately.

Is noncardiogenic pulmonary edema contagious?

Noncardiogenic pulmonary edema itself is not contagious. However, if it is caused by an infection, your vet will assess whether an infectious pathogen is involved and advise accordingly.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Noncardiogenic Pulmonary Edema in Dogs and Cats: Symptoms, Imaging & Care Guide [2025]

Noncardiogenic pulmonary edema — a veterinary emergency

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: AVMA, ACVIM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate emergency care

•Persistent severe labored breathing with inability to rest calmly
•Obvious purple or blue discoloration of the lips or gums
•Repeated fainting, altered consciousness, or unresponsiveness

Schedule a clinic visit soon (within 24–72 hours)

•Persistently elevated respiratory rate but able to rest briefly
•Frequent coughing, wheezing, or open-mouth breathing
•Noticeably reduced appetite or decreased activity level

01What symptoms indicate something is wrong?

Noncardiogenic pulmonary edema primarily presents with respiratory distress and systemic signs, often accompanied by changes in behaviour and appetite. Monitor your pet's breathing pattern and mental state closely.

Rapid breathing, open-mouth breathing, or audible wheezing
Wet crackles or abnormal breath sounds heard on auscultation or visibly laboured breathing
Elevated heart rate, possibly with outward signs of arrhythmia
Possible seizures, collapse, or altered mental status
Decreased appetite, reduced activity, or noticeably diminished exercise tolerance

Seek emergency care immediately if you notice the following symptoms:

⚠️ Difficulty breathing or blue/purple-tinted gums or lips — seek emergency care immediately
⚠️ Repeated collapse or loss of consciousness requires emergency veterinary care
⚠️ Extreme breathlessness and inability to rest quietly or lie down

02How can you tell if something is wrong? What to observe at home and when to go to the emergency vet

Observing and recording changes in your pet's breathing and overall condition at home will help your vet assess the situation and plan the right tests.

Count and record your pet's resting respiratory rate and note any open-mouth breathing
Film your pet's breathing, wheezing, and activity on your phone for the vet to review
Monitor for signs of lethargy, restlessness, or altered consciousness
Track any changes in appetite, water intake, and urination or defecation
Note changes in energy levels, exercise tolerance, and any recent weight changes

03How will the vet diagnose this? Common diagnostic tests

Your vet will use imaging and laboratory tests to evaluate the presence, cause, and severity of fluid in the lungs, and to rule out cardiac causes.

Chest X-ray

to assess pulmonary infiltrates, airway abnormalities, or pleural effusion

Thoracic ultrasound

for rapid evaluation of pleural effusion and related changes

Echocardiography

to rule out or evaluate cardiogenic pulmonary edema

Blood tests and blood gas analysis

to assess oxygenation, infection, and metabolic status

Lung or pleural fluid sampling

cytology and bacterial culture to identify infection

04What treatment and care will my pet need? Medications, dietary changes, and a care guide

Treatment focuses on acute supportive care. Once stabilised, regular follow-up visits and repeat imaging are needed to monitor recovery and identify any underlying cause to prevent recurrence.

In-hospital oxygen therapy and monitoring to relieve respiratory distress
Hospitalisation with intravenous fluids and vital sign monitoring if needed
Your vet will assess whether corticosteroids or other medications are appropriate
Thoracocentesis or further procedures may be performed if pleural effusion is present
Follow your vet's instructions for scheduled recheck appointments and repeat imaging after discharge

05What should you prepare before the vet visit? Key information to help your vet reach a diagnosis quickly

Bring phone videos showing your pet breathing rapidly, during activity, and at rest

Note the timeline of when symptoms first appeared and how they have progressed

Describe any changes in exercise tolerance or declines in activity level

Record any episodes of collapse or seizures, including their frequency and timing

List all current medications, supplements, and any previous medical conditions

Book ahead at a clinic that has chest X-ray equipment and on-site oxygen

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.