Coughing Assessment

Coughing in dogs and cats can range from a minor irritation to a sign of serious respiratory or cardiac disease. Unlike humans, who cough frequently from colds, persistent coughing in pets almost always indicates an underlying condition that needs investigation. Understanding the type of cough and accompanying symptoms helps determine urgency and likely causes.

## Types of Cough

**Dry, harsh cough:** Often sounds like a goose honk. Common in tracheal collapse (small breed dogs), kennel cough, and airway irritation.

**Moist, productive cough:** Sounds wet and may produce mucus or foam. Common in pneumonia, bronchitis, and pulmonary edema (fluid in lungs from heart disease).

**Gagging or retching cough:** Cough followed by gagging or attempts to vomit. Common in kennel cough, post-nasal drip, and tracheal irritation.

**Nocturnal cough:** Coughing that worsens at night or when lying down. Characteristic of heart disease and congestive heart failure (CHF).

## Common Causes in Dogs

**Infectious:** Kennel cough (Bordetella/canine infectious respiratory disease complex) — highly contagious, typically self-limiting in healthy dogs. Canine influenza, pneumonia (bacterial, viral, or aspiration), and canine distemper.

**Cardiac:** Congestive heart failure — especially common in older small breed dogs. Mitral valve disease causes coughing due to an enlarged heart pressing on airways and fluid accumulation in the lungs. Dilated cardiomyopathy in large breed dogs.

**Structural:** Tracheal collapse — common in toy breeds (Yorkshire Terriers, Pomeranians, Chihuahuas). Causes a characteristic "goose honk" cough triggered by excitement, pulling on a leash, or drinking water. Brachycephalic airway syndrome in flat-faced breeds. Laryngeal paralysis in older large breed dogs.

**Allergic/Inflammatory:** Chronic bronchitis, allergic airway disease, and eosinophilic bronchopneumopathy.

**Parasitic:** Heartworm disease, lungworms (Oslerus, Crenosoma, Angiostrongylus), and migration of intestinal parasites through the lungs.

**Neoplastic:** Primary lung tumors, metastatic cancer to the lungs.

## Common Causes in Cats

Cats cough less frequently than dogs, so coughing in cats is often more significant. Common causes include feline asthma (allergic bronchitis) — the most common cause of coughing in cats, heartworm disease, chronic bronchitis, pneumonia, pleural effusion (fluid around the lungs), and lung tumors. Note that cats with heart disease rarely cough (unlike dogs) — they more commonly present with difficulty breathing or open-mouth breathing.

## When to Seek Emergency Care

Seek immediate veterinary attention if coughing is accompanied by difficulty breathing or rapid breathing, blue or grey gums (cyanosis), collapse or extreme weakness, coughing up blood (hemoptysis), inability to rest or lie down due to breathing difficulty, or open-mouth breathing in cats (always an emergency).

## What to Do at Home

For mild, occasional coughing without respiratory distress, note the characteristics of the cough (dry vs. wet, timing, triggers), record when it occurs (night, after exercise, after drinking), check for nasal discharge, monitor appetite and energy level, use a harness instead of a collar (reduces tracheal pressure), use a humidifier to moisten airways, and avoid smoke, strong perfumes, and dusty environments.

## Diagnosis

Your veterinarian may recommend chest X-rays (most important initial test), blood work including heartworm test, echocardiogram (heart ultrasound) if cardiac disease is suspected, tracheal wash or bronchoalveolar lavage for cytology and culture, CT scan for complex cases, and laryngeal examination under sedation.

## Prevention

Keep vaccinations current (Bordetella, canine influenza), maintain year-round heartworm prevention, avoid exposure to smoke and airborne irritants, use a harness for dogs prone to tracheal collapse, and maintain a healthy weight to reduce cardiac and respiratory strain.

## Diagnostic Testing for Cough

Your veterinarian will use a systematic approach to diagnose the cause of your pets cough:

**Physical examination:** Tracheal palpation (tracheal sensitivity suggests kennel cough or collapsing trachea), thoracic auscultation (crackles suggest pneumonia or pulmonary edema; wheezes suggest asthma or bronchitis), and heart auscultation (murmurs or arrhythmias suggest cardiac disease).

**Thoracic radiographs (chest X-rays):** The most important diagnostic tool for coughing pets. These can identify pneumonia patterns, cardiac enlargement, pleural effusion, lung masses, collapsing trachea, and bronchial patterns consistent with asthma or chronic bronchitis.

**Bloodwork:** CBC to assess for infection or eosinophilia (allergic/parasitic causes), heartworm testing (Snap 4Dx or similar), and chemistry panel to evaluate overall health.

**Advanced diagnostics when needed:** Bronchoscopy with bronchoalveolar lavage (BAL) for chronic cough cases, echocardiogram for suspected cardiac cough, CT scan for complex thoracic disease, and tracheal wash for cytology and culture.

## Breed-Specific Cough Conditions

**Small breed dogs:** Collapsing trachea (Yorkies, Pomeranians, Chihuahuas, Toy Poodles) — classic honking cough worsened by excitement, pulling on collar, or hot weather. Mitral valve disease (Cavalier King Charles Spaniels) — cardiac cough from left-sided heart failure.

**Brachycephalic breeds:** Elongated soft palate and narrow trachea contribute to chronic coughing and respiratory noise.

**Cats:** Feline asthma is a common cause of coughing in cats — they assume a characteristic crouched posture with extended neck during coughing episodes.

*Written by PetNurse Clinical Team · Sources: AVMA, ACVIM Pulmonology, Merck Veterinary Manual*