SYMPTOM
Harsh dry cough
A harsh dry cough is a loud, rasping or honking cough that brings up little or nothing. It often comes in bouts, and a bout may end in retching or gagging. In some dogs it is set off by excitement, by being picked up or by a pull on the collar.
Tracheal Collapse
Weakening of the tracheal cartilage rings allows the airway to flatten intermittently, producing a persistent harsh, dry, honking cough that worsens with excitement, heat or pressure on the neck from a collar. It is most typical in small and toy breeds such as Yorkshire Terriers, Pomeranians and Chihuahuas, particularly when carrying extra weight.
Infectious Tracheobronchitis (Kennel Cough Complex)
A viral or bacterial infection of the trachea and upper airway produces a sudden, harsh, paroxysmal cough, often following recent boarding, training classes or contact with other dogs. The cough typically starts 5 to 10 days after exposure. In otherwise healthy dogs the illness is usually mild and self-limiting: severity tends to ease during the first 5 days, but the cough lasts 10 to 20 days.
Laryngeal Disease
Laryngeal paralysis, more common in older large-breed dogs such as Labradors, reduces the airway's ability to open fully during breathing and produces a harsh cough alongside voice change and reduced exercise tolerance. Acute laryngitis from irritant exposure or prolonged barking can cause a similarly harsh, dry cough.
Cardiac-Related Cough
Heart enlargement in dogs, whether from mitral valve disease in small breeds or dilated cardiomyopathy in breeds such as Dobermanns, has traditionally been thought to cause a cough when the enlarged left atrium presses on the airway. The published evidence is mixed. In a study of 206 dogs with mitral valve disease, coughing was associated with left atrial enlargement and with an abnormal airway pattern on chest radiographs, but not with congestive heart failure. A bronchoscopy study of 16 coughing dogs with mitral valve disease found no association between left atrial enlargement and airway collapse, and a 2025 radiographic study of 37 dogs with severe mitral valve regurgitation concluded that compression by an enlarged heart is an unlikely cause of chronic cough. A harsh, dry cough in a dog with a heart murmur may therefore come from a concurrent airway problem, such as chronic bronchitis or tracheal collapse, and the sound of the cough does not separate a heart cause from an airway cause.
Environmental Irritant Reflex
Brief exposure to smoke, dust, aerosols or cold air can trigger a short bout of dry coughing as a normal protective airway reflex. A reflex cough of this kind stops once the irritant is removed. Smoke and other airborne irritants also bring out the cough of tracheal collapse and can cause laryngitis, so a cough that continues or keeps returning does not fit a simple reflex.
Why timing matters
Early observation
In the first hours and days the cause sets the pace. In laryngitis, swelling of the larynx can build within hours, bringing increased effort to breathe in and a high-pitched noise from the throat. Kennel cough is usually mild, but puppies are more prone to severe disease.
Later presentation
A cough that continues for weeks points away from a passing infection. The cough of tracheal collapse is chronic. Acquired laryngeal paralysis progresses over months to years. Kennel cough may be followed by chronic bronchitis in debilitated or aged dogs.
What cannot be judged at home is where the cough comes from, because tracheal collapse, laryngeal disease, infection and airway disease alongside heart disease can sound alike. How the dog is breathing carries more weight than how loud the cough is. Dogs with laryngeal paralysis overheat in conditions that would not trouble a normal dog, and in severe cases the airway can close completely.
Conditions commonly associated
Infectious Tracheobronchitis (Kennel Cough)
The characteristic hacking cough results from inflammation and irritation of the trachea and bronchi.
Laryngeal Paralysis in Dogs
Laryngeal paralysis causes the cartilages of the larynx to fail to open fully during breathing. A dry cough is listed among its signs, with voice change and noisy breathing, and the noisy breathing can progress to marked difficulty in breathing with stress and exertion.
Dilated Cardiomyopathy in Dogs
Dilated cardiomyopathy enlarges the heart, and cough is listed among its signs once heart failure develops. Compression of the left mainstem bronchus by the enlarged heart is the traditional explanation for a harsh, dry cough, but studies in dogs with mitral valve disease have questioned that mechanism, so a concurrent airway cause is also possible.
Pneumonia
Pneumonia more typically produces a deep cough, with lethargy, loss of appetite and laboured breathing, than a harsh, dry one. The harsh, dry cough of kennel cough can progress to bronchopneumonia, particularly in puppies, at which point the cough becomes productive.
Tracheal Collapse in Dogs
Flattening of the tracheal cartilage rings produces a chronic harsh, dry cough likened to a goose honk, most often in small breeds such as Yorkshire Terriers, Pomeranians and Chihuahuas.
Chronic Bronchitis in Dogs
Chronic bronchitis is defined as a cough lasting at least two months that is not due to another respiratory disease. It may follow kennel cough in debilitated or aged dogs.
When to explore further
When the cough comes with laboured or noisy breathing, a blue or purple tinge to the tongue or gums, fainting or collapse. These signs are described in severe tracheal collapse, laryngeal paralysis and laryngeal swelling, and mark an airway that is not moving enough air
When fever, a pus-like nasal discharge, dullness, loss of appetite or a cough that turns productive appear alongside. In a dog with kennel cough these signs indicate bronchopneumonia
When the cough outlasts the 10 to 20 days expected of kennel cough. A cough that persists for two months or more, with no other respiratory disease found, meets the definition of chronic bronchitis
When the cause is uncertain. The causes listed here share the same harsh, dry sound, and some cannot be confirmed without examination: laryngeal paralysis, for example, is confirmed by viewing the larynx under light anaesthesia
Noting when the cough occurs, what sets it off and how it changes over time can provide useful information for veterinary discussions.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS