Coughing in Horses: 2025 Vet Guide on Causes, Diagnosis & Treatment by Dr Duncan Houston 🐴🩺

Hello! I’m Dr Duncan Houston, veterinarian and founder of AskAVet.com. Coughing is a common—but sometimes serious—symptom in horses. In this expert 2025 guide, we cover causes, cough types, diagnostic strategies, treatment options (medical, environmental, nutritional), and the critical signs that demand prompt veterinary care. Let’s help your horse breathe easier and stay healthy! 💙

🔍 Why Horses Cough

A cough is a normal reflex to clear the airway. However, frequent or persistent coughing often indicates underlying disease ranging from mild irritation to life-threatening conditions. :contentReference[oaicite:3]{index=3}

🏷️ Types of Coughs by Situation

1. Exercise-Induced Cough

• Common early in a ride as mucus clears—but frequent coughing throughout is abnormal.
• May signal infections, airway abnormalities (e.g., displaced soft palate), or bleeding in lungs (EIPH). :contentReference[oaicite:4]{index=4}

2. Wet/Productive Cough

• Mucus expelled—clear or light mucus suggests allergies or viral causes; thick yellow/white suggests bacterial infection. :contentReference[oaicite:5]{index=5}

3. Post-Trailer/Transport Cough

• Even a few coughs after travel may indicate "shipping fever" or pneumonia. :contentReference[oaicite:6]{index=6}

4. Resting or Frequent Cough

• Cough accompanied by nasal discharge, lethargy, or fever requires prompt investigation. :contentReference[oaicite:7]{index=7}

⚠️ Common Underlying Causes

- Viral Infections

Equine influenza, herpesvirus, adenovirus cause dry or nasal-discharge coughs; usually 10–21 days recovery. :contentReference[oaicite:8]{index=8}

- Bacterial Pneumonia or "Shipping Fever"

Bacterial infection after travel; productive cough, fever, reduced appetite—treat with antibiotics and rest. :contentReference[oaicite:9]{index=9}

- Recurrent Airway Obstruction (Heaves) & Inflammatory Airway Disease (Asthma)

Environmental dust triggers inflammation—chronic cough, nasal discharge, exercise intolerance. Heaves shows “heave line” and labored breathing. :contentReference[oaicite:10]{index=10}

- Parasites

Foals often cough from migrating roundworms (ascarids), with worms sometimes coughed up. :contentReference[oaicite:11]{index=11}

- Allergies

Hay, bedding, molds provoke persistent, dry or mild productive coughs. :contentReference[oaicite:12]{index=12}

- Structural/Neuromuscular Issues

Palate displacement or laryngeal paralysis restrict airflow and cause cough/wheezing. :contentReference[oaicite:13]{index=13}

- Congestive Heart Failure

Rare, but fluid buildup may cause persistent cough and fatigue. :contentReference[oaicite:14]{index=14}

🩺 Diagnostic Approach

1. Complete history: onset, context, environment, exercise.
2. Physical exam: auscultation, temperature, respiratory rate.
3. Endoscopic evaluation for airway obstructions.
4. Imaging: thoracic radiographs, ultrasound.
5. Bloodwork and tracheal wash/BAL for infection/inflammation analysis. :contentReference[oaicite:15]{index=15}
6. Fecal exam for parasite eggs.
7. Allergy testing or environmental assessment.

🛠 Treatment Strategies

Viral Cases

• Isolate, rest, manage fever, soak hay for dust reduction.
• Supportive care—NSAIDs, hydration; secondary antibiotics if pneumonia suspected.

Bacterial Pneumonia

• Appropriate antibiotics based on culture (e.g., penicillin, ceftiofur).
• Rest, supportive care; follow-up imaging often needed.

Asthma / Heaves

• Environmental control: dust-free hay, improved ventilation, use of low-dust bedding. :contentReference[oaicite:16]{index=16}
• Medications: corticosteroids, bronchodilators via inhalers or nebulizers. :contentReference[oaicite:17]{index=17}
• Pasture turnout beneficial.

Parasite-Induced Cough

• Deworm foals with fenbendazole or ivermectin; repeat as advised.
• Monitor fecal egg counts to confirm success.

Structural Airway Disorders

• Surgical correction (tie-back, tie-forward, soft palate rein, etc.) under veterinary guidance. :contentReference[oaicite:18]{index=18}

Heart Failure

• Specialist diagnosis (ultrasound, ECG); treatment may include diuretics and supportive care. :contentReference[oaicite:19]{index=19}

🏡 Environmental & Nutritional Management

• Soak or steam hay to reduce dust; minimize dusty bedding. :contentReference[oaicite:20]{index=20}
• Ensure well-ventilated barns and minimize indoor time. :contentReference[oaicite:21]{index=21}
• Add respiratory support supplements under vet guidance.
• Maintain appropriate turnout, avoid high allergen pastures.

📌 Monitoring & Prevention

• Track cough frequency, context, severity—log via AskAVet.com.
• Early veterinary evaluation prevents chronic issues. :contentReference[oaicite:22]{index=22}
• Vaccinate against influenza and herpes for respiratory disease prevention.
• Monthly deworming for foals; adult herd based on fecal counts.

📊 2025 Vet Quick Reference Table

🌟 Final Thoughts from Your 2025 Vet

Coughing can be harmless—but often signals deeper issues. With careful diagnosis, targeted treatment, environmental adjustments, and timely veterinary evaluation, most horses recover fully or manage well long-term. Keep detailed logs with AskAVet.com and lean on expert support—signs today can shape tomorrow’s health. 🐎✨

📲 Download the AskAVet.com app to share videos, set reminders, log symptoms, and receive personalized respiratory care plans from equine vets. 💙