SYMPTOM
Coughing
A forceful expulsion of air from the lungs that may sound dry, wet, or honking depending on the cause.
Airway disease
Conditions affecting the trachea and bronchi — including tracheal collapse, chronic bronchitis, and bronchomalacia — can produce characteristic coughs. Tracheal collapse often generates a distinctive 'goose honk' cough, while bronchitis tends to produce a harsher, drier hacking sound. These conditions may be triggered or worsened by excitement, exercise, pulling on the lead, pressure on the throat, or exposure to irritants such as dust, smoke, or cold air.
Cardiac
Coughing can be associated with heart disease, particularly conditions that cause enlargement of the left atrium, which can press on the mainstem bronchi and stimulate a cough reflex. In more advanced cardiac disease, fluid accumulation in or around the lungs (pulmonary oedema or pleural effusion) can also produce coughing. Cardiac coughs often worsen at night or during rest, and may be accompanied by exercise intolerance, increased breathing rate, or episodes of weakness.
Infectious
Respiratory infections caused by viruses, bacteria, or fungi can produce acute or chronic coughing. Canine infectious respiratory disease complex (kennel cough) is among the most common infectious causes, producing a forceful, paroxysmal cough that may be followed by gagging or retching. Pneumonia — whether bacterial, viral, fungal, or aspiration — typically produces a moist, productive cough often accompanied by systemic signs such as lethargy, reduced appetite, and fever.
Pulmonary
Conditions directly affecting the lung tissue — including pulmonary fibrosis, lung lobe torsion, or space-occupying lesions within the lungs — can produce chronic coughing. Primary or metastatic lung tumours may cause a progressive cough that worsens over time, sometimes accompanied by blood-tinged sputum. Pulmonary conditions can be challenging to characterise from cough quality alone and often require imaging for definitive assessment.
Laryngeal
Conditions affecting the larynx, including laryngeal paralysis, laryngeal inflammation, or laryngeal masses, can produce coughing particularly associated with eating, drinking, or excitement. The cough may have a distinctive quality — often described as a weak, hoarse cough — and may be accompanied by noisy breathing, voice changes, or gagging during meals. Laryngeal conditions can affect the protective function of the airway, potentially leading to aspiration of food or water into the lower airways.
Why timing matters
Early observation
When coughing is first noticed, it may present as an occasional throat-clearing sound, a soft hack after excitement or exercise, or a few coughs upon waking. Early coughing can be intermittent and may initially seem unremarkable, particularly if the animal appears well otherwise. The character of the cough — whether dry and hacking, moist and productive, honking, or wheezy — can provide early clues about its origin even at this stage. A cough that appears specifically during or after exercise, at night, or when pressure is applied to the trachea may point toward different underlying causes.
Later presentation
Coughing that persists for weeks, intensifies, or changes in character may indicate an ongoing process affecting the airways, lungs, or heart. A cough that was initially occasional may become more frequent, more forceful, or accompanied by gagging, retching, or expectoration of mucus. Persistent coughing can lead to secondary effects including throat irritation, fatigue from the physical effort of coughing, disrupted sleep, and reduced exercise tolerance. The development of additional respiratory signs — such as increased breathing rate, laboured breathing, or reduced ability to exercise — alongside a chronic cough may suggest progression of the underlying condition.
Coughing trajectories vary widely with cause. Infectious coughs (such as kennel cough) often follow a predictable arc — worsening over several days, plateauing, then gradually resolving over one to three weeks. Cardiac-related coughs tend to develop gradually and worsen in parallel with the underlying heart condition, often becoming more prominent at night or during rest. Airway disease may produce a chronic, fluctuating cough that waxes and wanes with triggers such as dust, smoke, excitement, or temperature changes. A cough that steadily worsens without periods of improvement, or one that develops new characteristics such as blood-tinged expectoration, may indicate a progressive process.
Conditions commonly associated
Feline Asthma
Dilated Cardiomyopathy in Dogs
Mitral Valve Disease in Dogs
Coughing is one of the cardinal signs of mitral valve disease, particularly as the disease progresses toward heart failure. The enlarged left atrium can compress the left mainstem bronchus, causing a mechanical cough, while pulmonary oedema from congestion produces a different cough pattern associated with fluid in the airways.
Tracheal Collapse in Dogs
Tracheal collapse produces a characteristic dry, honking cough that is often the most prominent and recognisable sign of the condition, triggered by excitement, collar pressure, or changes in respiratory effort.
Congestive Heart Failure in Dogs
Coughing in congestive heart failure results from pulmonary oedema irritating airway receptors and from compression of the left mainstem bronchus by the enlarged left atrium, producing a cough that is often most prominent at night or when lying down.
Kennel Cough in Dogs
A harsh, dry, honking cough is the hallmark of kennel cough, produced by inflammation and irritation of the tracheal and bronchial mucosa following infection with one or more pathogens in the canine infectious respiratory disease complex.
Chronic Bronchitis in Dogs
A persistent daily cough lasting at least two months is the defining clinical feature of chronic bronchitis, driven by ongoing airway inflammation, mucus hypersecretion, and airway hyperreactivity.
Brachycephalic Obstructive Airway Syndrome (BOAS) in Dogs
Airway irritation and turbulent airflow in BOAS can trigger coughing, particularly during exertion or excitement.
Heartworm Disease in Dogs
Heartworm-associated lung disease often manifests as a persistent cough, which may be one of the earliest noticeable signs of infection.
Aortic Stenosis
If aortic stenosis progresses to heart failure, coughing may develop due to pulmonary congestion, though this is less common than in other heart conditions.
Pneumonia
Pneumonia typically causes a moist, productive cough as the body attempts to clear infected material from the airways.
Megaoesophagus
Aspiration of regurgitated material into the airways causes coughing and poses pneumonia risk.
When to explore further
A cough that persists for more than two weeks without clear improvement, or one that follows a progressive pattern of worsening, may benefit from further assessment to identify the underlying cause and determine whether the airways or lungs are involved.
When coughing is accompanied by exercise intolerance, laboured breathing, an increased breathing rate at rest, or episodes of weakness, the combination may suggest that the cough is part of a broader respiratory or cardiovascular process.
A change in the character of an established cough — from dry to moist, from intermittent to constant, or the new appearance of blood-tinged material — may indicate progression or complication of the underlying condition.
Coughing in combination with a reduced appetite, weight loss, or lethargy may suggest a systemic process rather than a simple airway irritation, particularly if these signs develop progressively.
A honking or goose-like cough in a small-breed dog, or a cough that worsens notably at night in a middle-aged to older dog, may carry particular significance related to common breed-associated conditions.
Paying attention to the character of the cough (dry, moist, honking, wheezy), when it occurs (during exercise, at rest, at night, upon excitement), and whether it has changed over time can provide valuable information. Noting whether the cough is accompanied by any other signs such as exercise intolerance, breathing changes, nasal discharge, or appetite shifts may help build a more complete picture of the pattern.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS