Types of Cough and What They Suggest
Not all coughs are equal. The character of the cough provides important diagnostic clues.
Dry, hacking, “honking” cough. Classic for kennel cough (infectious tracheobronchitis) or tracheal collapse. Sounds like a goose honk. Often triggered by excitement, pulling on a leash, or drinking water.
Moist, productive cough. Suggests fluid or mucus in the airways. Associated with pneumonia, chronic bronchitis, or advanced heart disease with pulmonary edema.
Gagging or retching cough. The dog coughs and then gags, sometimes producing white foam. Common with kennel cough (the gag at the end often makes owners think the dog is vomiting) and posterior nasal drip.
Nocturnal cough (worse at night or when lying down). A hallmark of congestive heart failure. The recumbent position increases venous return to the heart, worsening pulmonary congestion. Also seen with tracheal collapse.
Exercise-induced cough. Seen with heart disease, chronic bronchitis, and tracheal collapse. Dogs that cough specifically during or after exertion need cardiac and respiratory evaluation.
Possible Causes Ranked by Likelihood
Common Causes
Kennel cough (infectious tracheobronchitis). The most common cause of acute coughing in otherwise healthy dogs. Caused by Bordetella bronchiseptica, canine parainfluenza virus, and other agents. Highly contagious. Produces a dry, hacking cough often followed by gagging. Most cases are self-limiting within 7-14 days. Dog parks, boarding facilities, groomers, and shelters are common exposure points.
Chronic bronchitis. Persistent inflammation of the bronchial airways. Defined as a cough lasting more than 2 months with no other identifiable cause. More common in middle-aged to older small and medium breeds. Produces a dry to moist cough that worsens with excitement or exercise.
Tracheal collapse. Progressive weakening of the tracheal cartilage rings, causing the trachea to flatten during breathing. Most common in toy and small breeds: Yorkshire Terriers, Pomeranians, Chihuahuas, Toy Poodles. The classic “goose honk” cough is triggered by excitement, pressure on the throat (collar), humidity, or obesity. Severity ranges from mild (occasional cough) to life-threatening (respiratory distress).
Moderately Common
Heart disease (congestive heart failure). The second most common cause of chronic coughing in older dogs. Mitral valve disease (the most common cardiac disease in dogs) causes left-sided heart enlargement, which compresses the left mainstem bronchus and eventually leads to pulmonary edema. Cavalier King Charles Spaniels have an extraordinarily high prevalence (nearly 100% by age 10). Other predisposed breeds include Dachshunds, Chihuahuas, and Miniature Poodles. Large breeds with dilated cardiomyopathy (Doberman Pinschers, Great Danes, Boxers) can also present with cough.
Pneumonia. Bacterial, viral, or aspiration pneumonia produces a moist cough with fever, lethargy, nasal discharge, and increased respiratory rate. Aspiration pneumonia (inhaling food or fluid) is more common in brachycephalic breeds and dogs with laryngeal paralysis or megaesophagus.
Canine influenza. Similar presentation to kennel cough but often more severe. Two strains circulate (H3N8, H3N2). Approximately 20% of infected dogs remain asymptomatic, 80% develop mild to moderate illness, and a small percentage progress to severe pneumonia.
Less Common but Serious
Laryngeal paralysis. Dysfunction of the laryngeal nerves, causing the larynx to fail to open properly during breathing. Produces a characteristic voice change (hoarse bark), loud breathing, coughing, and exercise intolerance. Most common in Labrador Retrievers and other large breeds over 10 years.
Pulmonary tumors. Primary lung cancer or metastatic cancer can cause chronic coughing, especially in older dogs. A persistent, non-responsive cough in a senior dog warrants chest radiographs.
Fungal infections. Blastomycosis, histoplasmosis, coccidioidomycosis are geographically restricted fungal infections that can affect the lungs. Endemic areas in the US include the Ohio and Mississippi River valleys, Great Lakes region, and desert Southwest.
Brachycephalic obstructive airway syndrome. French Bulldogs, English Bulldogs, Pugs, and other flat-faced breeds have anatomically narrowed airways. While not always a “cough” per se, the snoring, gagging, and respiratory noise can be difficult to distinguish from coughing.
Severity Scale
Monitor at Home (3-5 Days)
- Mild, intermittent dry cough in an otherwise healthy, active dog
- Recent exposure to other dogs (kennel cough likely)
- No fever, nasal discharge, or difficulty breathing
- Dog is eating, drinking, and energetic
Call Your Vet (Within 1-2 Days)
- Cough persisting beyond 5-7 days
- Cough accompanied by green or yellow nasal discharge
- Decreased appetite or mild lethargy
- Cough worsening in frequency or severity
- Moist, productive cough
Emergency (Go Now)
- Difficulty breathing (increased effort, open-mouth breathing, elbows pushed out)
- Blue or purple tongue or gums (cyanosis)
- Collapse or fainting after coughing episodes
- Cough with blood or pink-tinged foam
- Coughing with rapid, labored breathing at rest (more than 40 breaths/minute)
- Brachycephalic breed in respiratory distress
Home Care for Mild Coughing
- Use a harness instead of a collar to avoid tracheal pressure
- Humidify the air if the environment is dry (a bathroom with a running shower can provide temporary relief)
- Limit exercise to short, calm leash walks
- Avoid irritants: cigarette smoke, strong perfumes, dusty environments
- Honey (1/2 to 1 tablespoon for medium to large dogs) may soothe throat irritation. Not a treatment, but can provide comfort. Do not give to puppies under 1 year.
- Maintain a healthy weight since obesity worsens both tracheal collapse and heart disease
Breed Predispositions
- Cavalier King Charles Spaniels: mitral valve disease (nearly universal by old age)
- Yorkshire Terriers and Pomeranians: tracheal collapse
- Labrador Retrievers: laryngeal paralysis in seniors
- French Bulldogs and Pugs: brachycephalic airway syndrome
- Chihuahuas: tracheal collapse, chronic bronchitis, mitral valve disease
Longevity Connection
Cardiac coughing in small breeds often signals the transition from compensated to decompensated heart disease, a critical inflection point. Early cardiac screening, particularly echocardiography for predisposed breeds, allows intervention with medications (pimobendan, ACE inhibitors, diuretics) before clinical signs become severe. The EPIC trial demonstrated that starting pimobendan in the preclinical stage of mitral valve disease delayed the onset of heart failure by approximately 15 months. Chronic respiratory conditions benefit from weight management and omega-3 supplementation for their anti-inflammatory effects.
Frequently Asked Questions
How do I know if my dog’s cough is kennel cough or something more serious? Kennel cough typically produces a dry, hacking cough with a characteristic gag at the end, in a dog that is otherwise eating, drinking, and active. It usually follows exposure to other dogs within the past 5-10 days. If the dog has a fever, difficulty breathing, nasal discharge, lethargy, or decreased appetite, or if the cough persists beyond 10-14 days, it may be a more serious condition requiring veterinary evaluation.
Can a dog’s cough be caused by allergies? Yes, though less commonly than in humans. Canine allergies more typically manifest as skin disease (itching, ear infections) rather than respiratory symptoms. However, some dogs do develop allergic bronchitis that presents as a chronic cough. Environmental factors like pollen, dust, and mold can trigger coughing in sensitized dogs.
Should I give my dog cough suppressant? Never give human cough medications without veterinary guidance. Some contain ingredients toxic to dogs (xylitol, pseudoephedrine, acetaminophen). Veterinary-prescribed cough suppressants (hydrocodone, butorphanol) may be appropriate for specific conditions, but suppressing a productive cough can be harmful if the dog needs to clear fluid from the lungs.
Is a coughing dog contagious to other dogs? If the cause is infectious (kennel cough, canine influenza), yes, it is highly contagious. Isolate the coughing dog from other dogs for at least 14 days after symptoms resolve. Kennel cough spreads through airborne droplets, direct contact, and contaminated surfaces. Canine influenza can be shed for 24-48 hours before symptoms appear.
Why does my dog cough more at night? Nocturnal coughing is significant. In heart disease, lying down increases blood return to a failing heart, worsening pulmonary congestion. In tracheal collapse, the recumbent position changes tracheal dynamics. In chronic bronchitis, accumulated secretions pool in the airways during rest. Consistent nighttime coughing warrants veterinary evaluation with chest radiographs as a minimum.
Can heart disease in dogs be treated? Yes. While heart disease is not curable, it is manageable. Medical therapy (pimobendan, ACE inhibitors, diuretics, spironolactone) can significantly improve quality and length of life. Dogs with well-managed heart disease can live months to years after diagnosis. Early detection through regular veterinary checkups and breed-specific cardiac screening is key.
References
- Keene BW, et al. “ACVIM consensus guidelines for the diagnosis and treatment of myxomatous mitral valve disease in dogs.” Journal of Veterinary Internal Medicine. 2019;33(3):1127-1140.
- Boswood A, et al. “Effect of pimobendan in dogs with preclinical myxomatous mitral valve disease (EPIC trial).” Journal of Veterinary Internal Medicine. 2016;30(6):1765-1779.
- Buback JL, et al. “Surgical treatment of tracheal collapse in dogs: 90 cases.” JAVMA. 1996;208(3):380-384.
- Ford RB. “Canine Infectious Tracheobronchitis.” Greene’s Infectious Diseases of the Dog and Cat. 5th ed. 2022.
This content is for informational purposes only and does not constitute veterinary advice. If your dog is showing signs of illness, consult a licensed veterinarian.