A dog cough is one of those sounds that stops you in your tracks. Whether it’s a sudden hack at 2 am or a persistent cough that’s been going on for days, it’s hard not to worry. And honestly? That instinct to pay attention is a good one.
Coughing in dogs is one of the most common reasons Keysborough pet owners book a vet visit. Sometimes it’s something mild that clears up on its own. Other times, it’s the first sign of something that needs prompt veterinary attention. The tricky part is knowing which is which.
This guide walks you through the most common causes of dog cough, the warning signs you should never ignore, and when it’s time to stop waiting and call your vet.
Why Is My Dog Coughing? Start Here
Before diving into specific causes, it helps to understand what a cough actually is. A cough is your dog’s airway clearing itself, whether that’s because of irritation, infection, fluid, or obstruction. The sound, timing, and pattern of the cough can all give your vet valuable clues.
Ask yourself:
- Did the cough come on suddenly, or has it been building?
- Does it sound wet and rattly, or dry and honking?
- Is it worse at night, during exercise, or after excitement?
- Has your dog recently been to a dog park, kennel, or grooming appointment?
- Are there other symptoms like lethargy, loss of appetite, or laboured breathing in dogs?
These details matter. When you bring your dog in for a check, the more information you can give your veterinarian, the faster they can narrow things down.
Common Causes of Coughing in Dogs
There is no single cause of coughing in dogs. Here are the most common reasons your dog may be coughing.
Kennel Cough: The Most Common Infectious Cause of Coughing in Dogs
If your dog has recently visited a dog park, boarding facility, grooming salon, or even a vet clinic, kennel cough is high on the list. It’s the most common infectious cause of coughing in dogs and spreads easily wherever dogs spend time together.
Kennel cough is a contagious upper respiratory infection caused by a mix of highly infectious bacteria and viruses, most commonly Bordetella bronchiseptica. It spreads through the air via coughing or sneezing, and by contact with contaminated surfaces.
The classic dog cough associated with kennel cough is a dry, hacking sound, sometimes described as a honk. It can make it look like your dog is trying to clear something from their throat. Symptoms usually develop within five to ten days of exposure to an affected dog, and the disease often persists for ten to twenty days.
Most dogs with kennel cough recover without treatment, but some, especially senior dogs and those with weakened immune systems, can develop secondary pneumonia. If your dog’s cough worsens or they seem unwell beyond just the cough, contact your vet.
Key signs of kennel cough:
- Dry, hacking cough or honk
- Coughing after excitement or exercise
- Mild runny nose
- Usually alert and eating normally
Most Australian vets see two to three mini-epidemics of kennel cough each year, typically in winter or peak boarding seasons. Vaccination is available and recommended, particularly for dogs that socialise regularly.
Tracheal Collapse: A Common Cause of Coughing in Small Dogs
Tracheal collapse is a condition where the rings of cartilage that keep the tracheal airway open begin to weaken and flatten. It’s more common in small dogs, including Pomeranians, Yorkshire Terriers, and Chihuahuas, and tends to worsen over time.
A collapsing trachea creates a dry cough similar to kennel cough, but it tends to occur at specific times. When a dog is calm, they can often breathe without issue, but when excited or stressed, the increased respiratory rate can trigger coughing. Dogs with tracheal collapse may also cough when pulling on a collar, during exercise, or in hot and humid environments.
The sound of a collapsed trachea is often described as a loud, dry, honking noise, similar to a goose honk.
Grades of tracheal collapse:
| Grade | What’s Happening | Symptoms |
|---|---|---|
| I | Minimal narrowing | Mild cough during excitement |
| II | ~50% collapsed | A more frequent cough may occur at rest |
| III | ~75% collapsed | Laboured breathing, gagging, and avoiding exercise |
| IV | Nearly complete collapse | Struggles to breathe even at rest |
If your dog is coughing with a honking sound and the cough seems linked to excitement or exertion, book a vet visit. X-rays and imaging can help diagnose tracheal collapse and rule out other causes.
Heart Disease and Coughing: What’s the Connection?
Heart disease in dogs is more common than many pet owners realise. Myxomatous mitral valve disease is the most common acquired heart disease in dogs, and is detected in approximately 30% of dogs aged 13 years and older, accounting for about 75% of all cardiovascular disease in dogs.
When a dog’s heart isn’t pumping efficiently, fluid can build up in or around the lungs. This puts pressure on the airway and leads to coughing. Dogs with heart disease often cough more at night or when lying down, and the cough tends to sound wet or rattly rather than dry.
Dogs with heart disease may also show:
- Reduced exercise tolerance
- Rapid or laboured breathing
- Swollen abdomen
- Pale or bluish gums
Heart disease in dogs is a progressive condition, but early detection through regular veterinary check-ups can make a real difference. Melbourne dog owners with older or small-breed dogs should be particularly attentive.
Pneumonia and Respiratory Infection
Pneumonia is a serious lung infection that causes inflammation deep in the respiratory system. In dogs, it can result from a bacterial or viral infection, an inhaled substance, or as a complication of kennel cough or another illness.
Dogs may develop bronchitis or pneumonia after a respiratory infection. They may also inhale dirt, grass seeds, or food, which can lead to an infection of the airways. Signs of pneumonia in dogs include:
- Wet, productive cough
- Fever and lethargy
- Rapid or difficulty breathing
- Loss of appetite
- Nasal discharge
Pneumonia requires veterinary care and often a combination of antibiotics, supportive care, and close monitoring. If your dog is coughing and seems genuinely unwell, don’t wait.
Chronic Bronchitis in Dogs
Chronic bronchitis is ongoing inflammation of the airway that causes a persistent cough lasting two months or more, without a clear infectious cause. Dogs with chronic bronchitis typically have a dry, hacking cough that is worse in the morning or after exercise.
It’s more commonly diagnosed in middle-aged to older dogs and can be managed but not cured. Dogs with chronic bronchitis need a long-term treatment plan with your veterinarian, which may include anti-inflammatory medication, bronchodilators, and environmental modifications like keeping them away from smoke or dusty environments.
Heartworm Disease
Heartworm disease is caused by a parasite transmitted through mosquito bites. Once inside the body, heartworms settle in the heart and lungs, causing serious damage over time. According to the Heartworm Surveillance Project Australia, roughly 1 in 179 dogs tested positive for heartworm in 2020, with prevalence higher in coastal regions where mosquito populations are more abundant.
Heartworm leads to coughing because the parasites physically obstruct the heart and lungs, reducing the dog’s ability to breathe normally. Left untreated, heartworm disease causes heart failure and can be fatal.
Prevention is the key here. A simple heartworm preventative, taken monthly or given as an annual injection, is far less costly and stressful than treatment. Talk to your vet about the right option for your dog.
Allergies and Environmental Irritants
Just like people, dogs can develop allergy-related respiratory symptoms. Pollen, dust mites, mould, cigarette smoke, and certain cleaning products can all irritate the airway and cause coughing.
Allergy-related dog cough tends to be seasonal or linked to specific environments. It often comes with other signs like itchy skin, watery eyes, or sneezing. If you suspect an allergy, your veterinarian can help identify triggers and discuss treatment options.
Foreign Objects in the Airway
Sometimes dogs inhale something they shouldn’t, such as a grass seed, a piece of food, or a small toy. This can become lodged in the airway and cause sudden, intense coughing. This is an emergency. If your dog is coughing frantically, struggling to breathe, or pawing at their mouth, see a vet immediately.
Warning Signs: When Your Dog Needs to See a Vet Right Away
Not every cough requires an emergency call, but some warning signs mean your dog needs urgent veterinary attention.
Go to the vet immediately if your dog:
- Is struggling to breathe or shows signs of respiratory distress
- Has blue, grey, or white gums
- Is coughing up blood
- Collapses or loses consciousness
- Has a cough that came on suddenly and is rapidly worsening
- Shows signs of extreme distress, like wide eyes and frantic breathing
Book a vet visit soon if your dog:
- Has had a persistent cough for more than a week
- Is coughing and off their food
- Is coughing and lethargic
- Has a cough that seems to be getting worse, not better
- Has recently been around other dogs and now has a hacking cough
At Keysborough Veterinary Practice, our Melbourne team offers urgent care for respiratory symptoms that can’t wait. We also use X-rays and ultrasounds to assess lung and heart conditions, and our general pathology services can help identify infections quickly.
Preventing Dog Cough Where Possible
While not all causes of coughing in dogs can be prevented, there are things you can do:
- Keep vaccinations up to date, including the kennel cough vaccination, especially if your dog socialises at dog parks or goes to boarding
- Use heartworm prevention year-round as recommended by your veterinarian
- Avoid smoke and dusty environments that can irritate a sensitive airway
- Use a harness instead of a collar for dogs prone to tracheal issues
- Schedule regular vet check-ups, particularly for senior dogs and small breeds prone to heart disease
Melbourne dog owners have access to year-round heartworm risk due to the mosquito season, so prevention is especially important. If you’re unsure whether your dog is covered, our vaccination and wellness services team can review your dog’s current preventative care.
FAQs
My dog is coughing, but seems fine otherwise. Should I still see a vet?
Yes. A cough that persists beyond a few days, even without other symptoms, is worth having checked. Many conditions, including early heart disease, are easier to manage when caught early.
What does kennel cough sound like?
It’s typically a dry, forceful hack or honk, often ending in a gag. Some owners describe it as sounding like their dog has something stuck in their throat.
Can dogs catch kennel cough even if they’ve been vaccinated?
Yes. The kennel cough vaccine significantly reduces the risk and severity, but it doesn’t cover every strain. Vaccinated dogs who develop kennel cough usually recover faster.
Is a coughing dog contagious to other dogs?
It depends on the cause. Kennel cough is highly contagious. If your dog is coughing and has recently been around other dogs, keep them away from other dogs until you’ve seen a vet.
When is a dog cough a veterinary emergency?
Any time your dog is struggling to breathe, has blue or grey gums, is coughing up blood, or collapses, that’s an emergency. Contact your vet or an emergency veterinary service immediately.
A Note from the Team at Keysborough Veterinary Practice
If your dog is coughing and you’re not sure whether it’s serious, the best thing you can do is call us. Our Melbourne veterinary team has been caring for pets in Keysborough and the surrounding suburbs since 1988. We’d rather answer your questions early than see a dog come in when things have progressed.
You can book an appointment online or call us on (03) 9798 7274. For dogs showing signs of respiratory distress, please use our urgent care service.
