Your dog coughs in fits sharp, harsh spasms, almost like something's stuck in the throat. It's worse first thing in the morning, or right after he gets up from a nap. This isn't just a tickle. It could be bronchitis inflammation of the airways that carry air into the lungs.
Key Takeaways
- Bronchitis is inflammation of the bronchial airways, sometimes extending into the lungs, and it comes in acute (sudden, short-term) and chronic (long-term, 2+ months) forms.
- A harsh, spasming cough is the hallmark sign, often worse after rest, at the start of exercise, or with a change in environment.
- Chronic bronchitis mostly affects middle-aged and older dogs, especially small breeds, and is defined as a cough lasting 2 months or more with no other explanation.
- Kennel cough (infectious tracheobronchitis) is a common trigger for acute bronchitis and is highly contagious among dogs in close contact.
- Diagnosis relies on history, chest X-rays, and sometimes bronchoscopy to rule out other causes of chronic coughing.
- Treatment addresses any underlying cause plus supportive care — rest, warmth, corticosteroids, and sometimes cough suppressants or antibiotics.
What Is Bronchitis?
Bronchitis is inflammation of the bronchial airways the branching tubes that carry air from the trachea into the lungs. It's usually discussed alongside tracheobronchitis, which is inflammation of both the trachea and the bronchial airways together, and it can be sudden (acute) or long-term (chronic). According to the Merck Veterinary Manual, it often occurs in dogs already dealing with some other respiratory disease or airway disorder.
What Causes Bronchitis in Dogs?
- Infectious tracheobronchitis (kennel cough) — often follows a viral respiratory infection
- Parasites
- Diseases of the mouth and pharynx
- Chronic coughing linked to heart or lung disease
- Smoke inhalation and exposure to chemical fumes
- Sudden weather changes or environmental stress, especially in middle-aged and older dogs
- Foreign bodies in the airway, or developmental abnormalities such as larynx deformities
Chronic bronchitis most often affects small-breed dogs, though larger breeds aren't exempt. It's defined specifically as a cough that persists for at least 2 months and isn't explained by any other respiratory disease.
Signs of Bronchitis in Dogs
- Spasms of harsh, dry coughing — the most prominent sign
- Coughing that's worse after rest, after a change in environment, or at the start of exercise
- A slightly raised body temperature
- Reduced exercise tolerance
- In infectious cases: retching or gagging following coughing spasms
The act of coughing is your dog's body trying to clear mucus and secretions from the airways. In acute bronchitis, the worst of it typically passes within 2 to 3 days, though the cough itself can linger for several weeks afterward. Severe bronchitis and pneumonia can look very similar and are sometimes hard to tell apart, because bronchitis can extend from the bronchial tubes into the lung tissue itself and become pneumonia.
Kennel Cough: The Most Common Trigger
Infectious tracheobronchitis better known as kennel cough results from inflammation of the upper airways and is usually mild, resolving on its own. It spreads quickly among dogs in close confinement, such as boarding kennels, shelters, or veterinary hospitals, and it's often caused by more than one virus or bacterium at once, with stress and poor ventilation increasing both susceptibility and severity.
The most common sign is harsh, dry coughing spasms, sometimes followed by retching. Severity usually eases within the first 5 days, but the illness itself can persist 10 to 20 days. Affected dogs otherwise seem largely normal, aside from some appetite loss. If fever, nasal discharge, depression, or a productive cough develop especially in puppies that usually signals a second infection layered on top, such as distemper or bronchopneumonia.
In young puppies, kennel cough can progress to fatal bronchopneumonia; in weakened, ill, or aged dogs, it can progress into chronic bronchitis. Our guide on how to prevent coughing in your dog covers vaccination, hygiene, and environmental steps that lower the risk of both kennel cough and the bronchitis that can follow it.
How Is Bronchitis Diagnosed?
Diagnosis is built from your dog's history, physical exam, and clinical signs, alongside ruling out other causes of coughing. Your vet may use:
- Chest X-rays — to see the severity of airway changes and rule out other lung or heart disease
- Bronchoscopy — a thin scope used to directly view the inside of the bronchial tubes
- Biopsy and swab samples for laboratory analysis
- Bronchial washing (bronchoalveolar lavage) — can identify the causative agent, such as a parasite, or show how the body is responding to disease
These more involved diagnostics usually come into play when initial treatment doesn't bring relief, or when the cough has been going on long enough to fit the definition of chronic bronchitis.
Treatment for Acute Bronchitis
- Rest, warmth, and good hygiene
- Treatment of any underlying disease driving the inflammation
- Cough suppressants (sometimes codeine-based) for a persistent, dry, non-productive cough
- Nebulisation or steam from a hot shower, to loosen secretions and help your dog cough them up
- Antibiotics only if a bacterial infection is confirmed or suspected
For kennel cough specifically, most dogs shouldn't be hospitalised the disease is highly contagious and generally resolves on its own with good nutrition, hygiene, and environmental support. Antibiotics are usually unnecessary except in severe or complicated chronic cases.
Treatment for Chronic Bronchitis
Chronic bronchitis is managed rather than cured, since the underlying airway changes are often long-standing. Corticosteroids are commonly used to reduce airway inflammation, and some vets prescribe them via inhaler to limit the body-wide side effects including diabetes mellitus risk that come with long-term oral steroid use. Bronchodilators may be added when airway narrowing is significant, helping the airways open and clear secretions more easily. VCA Animal Hospitals notes that most dogs with chronic bronchitis can be managed as outpatients, with hospitalisation reserved for dogs in significant respiratory distress needing oxygen support.
A vet-prescribed bronchodilator such as Deriphyllin Syrup is one option your vet may reach for to help ease airway constriction in chronic cases. Symptomatic support like Alex Syrup can help manage cough and congestion signs alongside your vet's core treatment, and an omega-3/omega-6 supplement such as Nutricoat Advance Syrup is sometimes used as a mild anti-inflammatory adjunct none of these substitute for your vet's diagnosis or prescribed treatment plan.
Reducing your dog's exposure to smoke, aerosol sprays, and other airborne irritants helps limit relapses, and relapses are common enough during weather changes and seasonal shifts that many dogs need periodic dose adjustments rather than a single fixed treatment.
Preventing Kennel Cough (and, By Extension, Bronchitis)
Vaccines are available to protect against several of the organisms responsible for kennel cough, including distemper, parainfluenza, canine adenovirus-2, and Bordetella bronchiseptica. Your vet will recommend the vaccination types and schedule most appropriate for your dog based on their lifestyle and exposure risk — dogs that visit boarding kennels, dog parks, or daycare need this protection the most.
Chronic Cough: Other Conditions That Look Similar
A long-term cough isn't automatically bronchitis. Heart disease, lung parasites, foreign bodies, and even certain cancers can produce a similar picture. In particular, the mediastinal (chest) form of lymphoma in dogs often presents with coughing and breathing difficulty, which is one reason vets rule out other causes with X-rays before settling on a bronchitis diagnosis, especially in older dogs.
Frequently Asked Questions
Is bronchitis in dogs contagious?
Bronchitis itself isn't contagious, but a common trigger infectious tracheobronchitis, or kennel cough is highly contagious among dogs in close contact. Chronic bronchitis that develops afterward is not something your dog can pass to other dogs.
How long does bronchitis last in dogs?
Acute bronchitis typically peaks within 2 to 3 days, though the cough can linger for several weeks. Chronic bronchitis, by definition, involves a cough lasting 2 months or more and is usually a long-term condition that's managed rather than cured.
Can bronchitis in dogs turn into pneumonia?
Yes. Severe bronchitis can extend from the bronchial tubes into the lung tissue itself, becoming pneumonia which is one reason vets take a persistent or worsening cough seriously rather than assuming it will resolve on its own.
Do all dogs with a cough need antibiotics?
No. Antibiotics are only needed when a bacterial infection is confirmed or strongly suspected. Many cases of acute bronchitis and kennel cough resolve with supportive care alone, and unnecessary antibiotic use doesn't help a viral or inflammatory cough.
Which dogs are most at risk of chronic bronchitis?
Middle-aged and older dogs are most affected, with small breeds especially represented, though large breeds can develop it too. Dogs with airway abnormalities or repeated respiratory infections are also at higher risk.
References
- Merck Veterinary Manual — Tracheobronchitis (Bronchitis) in Dogs. https://www.merckvetmanual.com/dog-owners/lung-and-airway-disorders-of-dogs/tracheobronchitis-bronchitis-in-dogs
- Merck Veterinary Manual — Bronchitis in Dogs. https://www.merckvetmanual.com/dog-owners/lung-and-airway-disorders-of-dogs/bronchitis-in-dogs
- VCA Animal Hospitals — Chronic Bronchitis in Dogs. https://vcahospitals.com/know-your-pet/chronic-obstructive-pulmonary-disease-copd-in-dogs
- VCA Animal Hospitals — Treatment Instructions for Bronchitis in Dogs. https://vcahospitals.com/know-your-pet/treatment-instructions-for-bronchitis-in-dogs
- Merck Veterinary Manual — Overview of Respiratory Diseases of Dogs and Cats. https://www.merckvetmanual.com/respiratory-system/respiratory-diseases-of-small-animals/overview-of-respiratory-diseases-of-dogs-and-cats
