What are the common causes of coughing in dogs and cats?

Coughing in dogs and cats can be caused by tracheal or pulmonary infections, heart disease, allergies, or foreign-body irritation, among other conditions. The exact cause needs to be determined by a vet through a physical examination and diagnostic imaging or tests — consult your vet for an accurate diagnosis.

What data can I collect at home to help the vet assess my pet?

You can track the time and frequency of coughing episodes, whether the cough is productive or bloody, resting respiratory rate, and video footage of the episodes — all of this information helps the vet evaluate your pet's condition quickly.

How long should I wait before taking my pet to the vet for coughing?

If coughing persists for more than a few days without improvement, is increasing in frequency, or is accompanied by breathing difficulty, lethargy, or poor appetite, bring your pet to the vet promptly to rule out serious causes.

What tests will the vet run to find the cause?

Common tests include chest X-ray, cardiac ultrasound (echocardiography), respiratory specimen analysis (PCR or bacterial culture), and cytology or histopathology if needed — your vet will decide which tests are appropriate based on the clinical picture.

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

Dog & Cat Cough: Symptoms, Chest X-Ray & Home Care Guide [2025]

Coughing is a sign of respiratory trouble that may be caused by infection, heart disease, or allergies — a proper diagnosis is needed before targeted treatment can begin.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: AVMA, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate emergency care

•Continuous open-mouth breathing with obvious difficulty breathing
•Lips or gums turning purple or pale
•Brief fainting or repeatedly losing consciousness and collapsing

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

•Frequent coughing that worsens at night or during exercise
•Changes in breathing sounds or persistent wheezing
•Decreased activity level with ongoing loss of appetite

01What symptoms indicate a problem?

Coughing is a common clinical sign in dogs and cats. It may be a brief irritation response or signal a more serious respiratory or cardiac condition. Noting the frequency, timing, and whether breathing effort is increased will help gauge severity.

Frequent dry coughing or occasional wet, productive cough
Coughing noticeably worse at night or after exercise
Changes in breathing sounds, including wheezing or crackles
Respiratory distress, rapid breathing, or open-mouth breathing
Lethargy or a marked decrease in activity
Reduced appetite or progressive weight loss

Seek emergency care immediately if you notice the following symptoms:

⚠️ Obvious breathing difficulty or open-mouth breathing
⚠️ Brief collapse or loss of consciousness
⚠️ Gums or lips turning purple or pale

02How to assess at home: monitoring tips and when to go to emergency

Recording and tracking key observations at home helps your vet quickly understand the progression and plan the right tests.

Note the time, frequency, and duration of each coughing episode
Record video of coughing on your phone (front and side angles)
Count resting respiratory rate and watch for open-mouth breathing
Monitor changes in alertness, activity level, and appetite
Watch for changes in elimination and signs of lethargy or collapse
If symptoms worsen, arrange a vet visit or emergency assessment promptly

03How will the vet make a diagnosis? Common diagnostic tests

At the clinic, the vet will combine a physical examination with imaging and lab results to identify the likely cause of coughing and decide on a treatment plan.

Chest X-ray

evaluates lung density, thoracic cavity, and heart size

Cardiac ultrasound (echocardiography)

assesses heart structure and function

Tracheal or bronchoalveolar wash cytology to detect inflammation or pathogens

Tissue biopsy (if needed)

histopathology to rule out neoplasia

Bacterial culture and sensitivity testing, plus PCR pathogen detection

Referral to a specialist hospital with advanced imaging or PCR capability is recommended when needed

04Post-diagnosis treatment and care: medications, diet adjustments, and home management

Treatment is tailored to diagnostic findings and must be combined with home care and regular follow-up to monitor effectiveness and side effects.

Medication or other therapies are chosen based on diagnostic results
Return visits during treatment are needed to assess response and watch for side effects
Ensure good ventilation at home and avoid irritants such as strong odours, smoke, or dust
Maintain good nutrition and adequate hydration to support recovery
Schedule follow-up imaging or blood tests to confirm treatment response
If symptoms recur or fail to improve, referral to a respiratory specialist is recommended

05What to prepare before the vet visit: key information to help the vet diagnose quickly

Record a video of the coughing episode (full duration) for the vet to review

Note when symptoms started, how they have changed, and any triggers or worsening

Measure and record the resting respiratory rate (breaths per minute)

List all current medications, vaccination history, and past medical conditions

Bring any previous X-rays or lab reports for comparison if available

Call ahead to make an appointment and describe the respiratory symptoms before arriving

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.