Why is my dog coughing: causes, home care & when to call the vet
A plain-English guide to coughing in dogs — what\'s usually fine, what isn\'t, and what to do today.
A cough is one of those symptoms where the *sound* and *trigger* tell a vet almost everything. A goose-honk cough triggered by leash pulling or excitement points one way; a moist, productive cough at rest or at night points another; a sudden retching cough in a dog who was just in kennels points a third.
Most coughs in dogs are not emergencies, but a cough that lasts more than 7 days, comes with breathing changes at rest, blue-tinged gums, or is paired with collapse is a different category — that's a same-day vet visit, not a wait-and-see.
A short phone video of the cough is the single most useful thing you can hand a vet. Sound, posture, frequency, and what triggers it — they will diagnose half the cases from the video alone.
Common causes
Infectious tracheobronchitis (kennel cough)
See a vet within 24–48 hoursDry, honking cough often after boarding, daycare, or grooming. Highly contagious. Most cases self-limit in 1–2 weeks; some need antibiotics.
Read more about infectious tracheobronchitis (kennel cough) →Reverse sneeze
Monitor at homeNot actually a cough — sudden noisy inward snorting, often from excitement or post-nasal irritation. Usually harmless; lasts seconds to a minute.
Tracheal collapse
See a vet within 24–48 hoursSmall-breed condition (Yorkies, Pomeranians, Chihuahuas, Maltese). Honking cough triggered by excitement, eating, drinking, or pulling on leash.
Read more about tracheal collapse →Heart disease (congestive heart failure)
See a vet within 24–48 hoursMoist or soft cough, often worse at night or after lying down. Paired with exercise intolerance, fast breathing at rest.
Read more about heart disease (congestive heart failure) →Pneumonia
See a vet within 24–48 hoursSoft moist cough, fever, lethargy, fast breathing. Can be bacterial, fungal, or aspiration. Needs vet care.
Heartworm
See a vet within 24–48 hoursCoughing, exercise intolerance, weight loss. Preventable with monthly prevention; treatment is risky and prolonged.
Read more about heartworm →Foreign body
Emergency — vet nowGrass awn, stick fragment, food inhaled. Sudden severe coughing, retching, distress.
Laryngeal paralysis
See a vet within 24–48 hoursLarge senior breeds (Labradors, Setters). Noisy raspy breathing, exercise intolerance, voice change. Surgical condition.
What you can safely do at home
- Take a video of the cough and another of your dog breathing at rest (count breaths per minute over 30 seconds; double it).
- Switch the collar for a harness — neck pressure aggravates almost every kind of dog cough.
- Reduce excitement and exercise for 24 hours while you decide next steps.
- Run a humidifier or take the dog into a steamy bathroom for 10 minutes — helps mild irritant or kennel-cough symptoms.
- Keep them away from other dogs if kennel cough is suspected — it's highly contagious for 1–3 weeks.
- A teaspoon of plain honey for dogs over 10kg (not puppies) can soothe mild irritation in the short term.
These steps are general guidance for an otherwise well, healthy adult pet. If your dog is a puppy/kitten, a senior, or has a known chronic condition, call a vet rather than waiting it out.
What to expect at the vet
The vet will usually:
- Listen to the heart and lungs; palpate the throat
- Chest X-rays — the single most useful test for distinguishing cough causes
- Heartworm test if not currently on prevention
- Bloodwork to screen for infection or systemic disease
- Echocardiogram if a heart cause is suspected on X-ray
Useful questions to ask:
- Is this airway, lung, or heart?
- Do we need chest imaging today?
- Could it be kennel cough — and is my dog contagious?
- What signs would mean breathing distress and an emergency visit?
- Should we change to a harness permanently?
How to reduce the chance of it happening again
- Monthly heartworm prevention year-round.
- Vaccinate against kennel cough (Bordetella) before boarding, daycare, or shows.
- Use a harness instead of a collar, especially for small breeds and brachycephalics.
- Maintain healthy weight — obesity strains the trachea and heart.
- Avoid smoking around the dog; smoke is a major airway irritant.
- Annual senior heart and lung check past age 7 in small breeds.
Frequently asked questions
Is kennel cough an emergency?
For a young, healthy adult dog — usually no, it self-limits in 1–2 weeks. For puppies, seniors, or any dog with breathing distress or lethargy alongside the cough, yes — see a vet today.
My dog coughs only at night — what does that mean?
Night-time or post-lying-down cough is classic for heart disease in older small breeds. Get a vet exam this week.
Is reverse sneezing dangerous?
Not in itself. Brief gentle throat massage during an episode helps. Frequent episodes warrant a vet check for nasal mites, allergies, or polyps.
Can I give cough medicine to my dog?
Human cough syrups often contain xylitol, paracetamol, or alcohol — toxic to dogs. Only vet-prescribed cough suppressants. Some dogs need the cough to clear material; suppressing it can mask pneumonia.
How long after kennel cough is my dog contagious?
Most dogs shed the pathogens for 1–3 weeks after symptoms start. Keep them isolated from other dogs through that window, including beyond when they personally feel better.