Pulmonary Fibrosis in Dogs: Symptoms, Treatment & Prognosis

What Is Pulmonary Fibrosis?

Pulmonary fibrosis is a progressive lung disease in which healthy lung tissue becomes scarred and thickened over time. The damage makes it harder for oxygen to pass into the bloodstream, causing chronic breathing difficulty.

In dogs, the condition is often called idiopathic pulmonary fibrosis when no specific cause can be identified. The disease tends to develop slowly, with symptoms often appearing in middle-aged or older dogs. While not curable, proper management can help maintain quality of life.

Symptoms of Pulmonary Fibrosis in Dogs

Early Signs

• Persistent dry cough that does not produce mucus
• Reduced tolerance for exercise — your dog may tire more quickly on walks
• Rapid or labored breathing during normal activity
• Lethargy and less interest in play or walks

Progressive Symptoms

• Increased respiratory rate at rest (breathing faster than normal)
• Open-mouth breathing or panting when not exercising
• Exercise intolerance worsening over months
• Weight loss despite normal appetite
• Bluish or gray gums (cyanosis) indicating low oxygen levels

Emergency Signs

• Severe difficulty breathing — gasping, extended neck, visible distress
• Collapse or inability to stand
• Extreme lethargy or unresponsiveness
• Cyanosis that does not improve with rest

What Causes Pulmonary Fibrosis in Dogs?

The exact cause is often unknown (idiopathic). Possible contributing factors include:

• Chronic inhalation irritants — smoke, dust, chemical fumes
• Previous lung infections or pneumonia
• Genetic predisposition (certain breeds are more affected)
• Environmental exposures over many years
• Drug toxicities (rare)
• Connective tissue disorders (rare)

Breeds Most at Risk

Pulmonary fibrosis is seen more often in:

• West Highland White Terriers — highest risk; genetic factors suspected
• Staffordshire Bull Terriers
• Cavalier King Charles Spaniels
• Miniature Schnauzers
• Dogs over 7 years of age

How Pulmonary Fibrosis Is Diagnosed

Your veterinarian will use several tools to diagnose pulmonary fibrosis:

1. Physical examination — listening for crackles or abnormal lung sounds
2. Chest X-rays — may show a diffuse, reticular or honeycomb lung pattern
3. CT scan (computed tomography) — more detailed imaging of lung structure
4. Blood work — to rule out infections and check organ function
5. Bronchoscopy — viewing the airways
6. Lung biopsy — definitive diagnosis but invasive; used when needed

Treatment Options

Medical Management

• Oxygen therapy — at home or in hospital during flare-ups
• Bronchodilators — may help in some cases
• Corticosteroids — to reduce inflammation; used cautiously
• Antibiotics — if secondary infection is suspected
• Pirfenidone — a medication that may slow fibrosis (off-label use)
• Phosphodiesterase-4 inhibitors — newer options under study

Surgical Options

There are no standard surgical treatments for pulmonary fibrosis. Lung transplant is not routinely performed in dogs.

Alternative/Supportive Therapies

• Weight management — keeping your dog lean to reduce breathing effort
• Gentle, low-impact exercise — short walks instead of long runs
• Stress reduction — avoiding overheating and crowded environments
• Humidified air — some owners find this helpful
• Supplements — only under veterinarian guidance

At-Home Care

• Avoid smoke and strong odors — keep the environment clean and well-ventilated
• Limit exercise to what your dog can comfortably tolerate
• Monitor breathing and note any worsening
• Keep appointments for rechecks and follow-up imaging
• Provide a cool, quiet resting area away from stressors

Prognosis & Life Expectancy

Pulmonary fibrosis is progressive and cannot be reversed. Prognosis varies:

• Mild to moderate cases: With treatment, many dogs live months to a few years with good quality of life.
• Severe cases: Survival may be weeks to months after diagnosis.
• West Highland White Terriers: Tend to have a more guarded prognosis due to breed-specific form of the disease.

Prevention

Because the cause is often unknown, prevention is limited. Steps that may help include:

• Avoiding smoke and air pollutants in the home
• Reducing exposure to dust and chemicals
• Prompt treatment of lung infections
• Regular veterinary checkups for at-risk breeds

Cost of Treatment

Costs vary by region and severity:

• Diagnosis: $500–$2,500 (X-rays, blood work, possibly CT)
• Ongoing care: $50–$200/month for medications and rechecks
• Emergency care: $500–$2,000+ for oxygen and hospitalization

Frequently Asked Questions