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Why Is My Dog Coughing?

DogMonitor
Quick Answer

Dog coughing can range from mild kennel cough (which usually resolves on its own) to signs of heart disease or pneumonia. A cough lasting more than a few days, or accompanied by lethargy, difficulty breathing, or loss of appetite, should be checked by a vet.

What You Need to Know

Coughing in dogs is a symptom, not a disease — the cause determines the treatment and urgency. The character of the cough is often the best diagnostic clue.

A harsh, dry, "honking" cough is classic for kennel cough (infectious tracheobronchitis), especially if your dog was recently around other dogs. Kennel cough sounds terrible but is usually self-limiting, resolving in 1-3 weeks. It's similar to a human cold — annoying but rarely dangerous in healthy adult dogs.

A soft, moist cough that sounds "wet" or produces phlegm may indicate pneumonia or fluid in the lungs. A cough that worsens at night or when lying down is concerning for heart disease — the heart enlarges and presses on airways, or fluid accumulates in the lungs.

A high-pitched, goose-honk cough in a small breed dog, especially triggered by excitement or pulling on a leash, is often from tracheal collapse — a condition where the tracheal cartilage rings weaken and the airway collapses during breathing.

Chronic coughing that doesn't respond to antibiotics or persists for weeks warrants further investigation. Possible causes include lungworm (especially in dogs who eat slugs or snails), heart disease, chronic bronchitis, or lung tumors.

Common Causes

  1. Kennel cough (infectious tracheobronchitis) — harsh, dry cough after dog exposure
  2. Heart disease — cough worse at night/lying down, in older dogs
  3. Tracheal collapse — goose-honk cough in small breeds
  4. Pneumonia — wet cough with fever, lethargy, difficulty breathing
  5. Chronic bronchitis — persistent cough in middle-aged to older dogs
  6. Foreign body — sudden onset after playing with sticks or eating bones
  7. Lungworm — especially in dogs who eat slugs/snails, increasingly common
  8. Allergies — seasonal cough with other allergy signs

Breed Variations

Toy breeds (Yorkies, Pomeranians, Chihuahuas, Toy Poodles) are prone to tracheal collapse — use a harness instead of a collar. Cavalier King Charles Spaniels have very high rates of heart disease-related cough. Bulldogs and other brachycephalic breeds have chronic airway issues. Large breeds (Dobermans, Irish Wolfhounds) are predisposed to dilated cardiomyopathy.

When to Worry

See a vet if the cough lasts more than 5 days, if it is accompanied by difficulty breathing or rapid breathing, if your dog is lethargic or not eating, if there is any nasal discharge that is thick or bloody, if the cough is productive (bringing up phlegm), or if your dog is a puppy, senior, or immunocompromised.

When NOT to Worry

If your dog was recently at a kennel, dog park, or groomer and develops a dry cough but is otherwise eating, drinking, and acting normally, kennel cough is likely and usually resolves on its own. The occasional cough (once or twice a day) in an otherwise healthy dog is usually not a concern.

Home Care Tips

For suspected kennel cough: isolate from other dogs for 2 weeks, use a harness instead of collar, run a humidifier, offer honey (1/2 to 1 tablespoon for medium dogs — NOT for puppies). Keep exercise light. Avoid irritants like cigarette smoke, strong perfumes, or dusty environments.

When to See a Vet

If symptoms persist for more than 24–48 hours, worsen, or are accompanied by lethargy, loss of appetite, or pain, see your vet promptly.

When in doubt, call your vet. A quick phone consultation can help you decide if an in-person visit is needed.

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