Dog Coughing: At a Glance
The type of cough + timing helps distinguish kennel cough from heart disease.
Cough Evaluation Decision Tree
Condition
| Condition | Cough Type | Timing | Other Signs | Treatment |
|---|---|---|---|---|
| Kennel Cough | Dry, honking, goose-like | Any time, worse with excitement | Normal energy, may have nasal discharge | Rest, cough suppressants, antibiotics if severe |
| Heart Disease | Soft, wet, gurgly | Night or when resting/lying down | Exercise intolerance, rapid breathing | Heart meds (pimobendan, diuretics, ACE inhibitors) |
| Pneumonia | Wet, productive, deep | Constant, worse after lying down | Fever, lethargy, loss of appetite | Hospitalization, IV antibiotics, oxygen |
| Tracheal Collapse | Dry, honking, goose-like | Triggered by excitement, pulling on leash | Normal between episodes | Weight loss, harness vs collar, cough meds |
| Heartworm Disease | Dry, persistent | Any time, worse with exercise | Weight loss, exercise intolerance | Heartworm treatment protocol (melarsomine) |
When Coughing Needs Immediate Vet Care
| Coughing + difficulty breathing or blue gums | |
| Coughing up blood or pink froth | |
| Collapse or fainting episodes | |
| Fever over 103.5°F with cough | |
| Complete loss of appetite for 24+ hours | |
| Known heartworm positive + new cough | |
| Coughing worsens over 48 hours despite rest | |
| Mild honking cough, normal energy, recent boarding | |
| Occasional dry cough only when excited |
Kennel cough is self-limiting in healthy dogs — it resolves in 7-14 days with rest and supportive care. However, puppies, seniors, and immunocompromised dogs can develop pneumonia. Seek vet care if your dog has a fever, loss of appetite, or worsening symptoms after 48 hours.
Heart disease cough is often mistaken for kennel cough. Key differences: heart cough is worse at night/rest (not with excitement), often accompanied by rapid breathing (>30/min at rest), and the dog has a history of exercise intolerance. A chest X-ray distinguishes the two.
Dog Coughing: When It's Kennel Cough vs Heart Disease
The sound, the timing, and one number you can check yourself set them apart.
petstore.comTwo coughs, two very different causes
Kennel cough
Dry, honking cough after boarding or group settings, usually clears in 1-3 weeks
Heart-related cough
Soft, moist cough worse at night or after lying down, often in older small-breed dogs
Check the resting respiratory rate yourself
Count breaths for 30 seconds while your dog is fully asleep, then double it. Consistently over 30-40 is worth a same-day call to your vet.
The sound and the timing tell you more than you would think
Two coughs can sound similar to an untrained ear but mean very different things. A dry, harsh, honking cough, often described as sounding like a goose, that shows up within a week of boarding, a dog park visit, a shelter stay, or grooming is the classic pattern of kennel cough, a highly contagious respiratory infection. A softer, moist-sounding cough that gets worse at night, after lying down, or during mild activity points somewhere else entirely: the heart.
Kennel cough usually looks worse than it is
Most healthy dogs with kennel cough clear it on their own within one to three weeks, with supportive care rather than aggressive treatment. It spreads easily between dogs sharing air space, which is exactly why it shows up after boarding or group settings. A dog that otherwise seems bright, eating normally, and just coughing is usually fine to manage at home with your vet's guidance, though very young, senior, or already-sick dogs need closer monitoring.
A heart-related cough follows a completely different pattern
Heart disease, most often mitral valve disease in small breed senior dogs or dilated cardiomyopathy in some larger breeds, can cause fluid to build up around the lungs as the heart struggles to keep up. That fluid triggers a cough that tends to be worse at night, after lying down, or with exertion, and is often paired with tiring faster on walks than before, or breathing that looks more labored than a simple cough would explain.
One number you can check yourself, right now
Counting your dog's breaths per minute while it is fully at rest and asleep is one of the most useful things an owner can do at home. A resting respiratory rate consistently above 30 to 40 breaths per minute is a recognized warning sign of fluid buildup from heart failure and is worth calling your vet about the same day, especially in a dog with a known heart murmur.
What separates the two conditions clinically
The Merck Veterinary Manual describes canine infectious tracheobronchitis (kennel cough) as typically self-limiting in one to three weeks in healthy adult dogs, with a dry, harsh cough as the hallmark sign following exposure in group settings. Separately, the manual identifies a resting respiratory rate above the 30-40 breaths per minute range as a clinically recognized indicator of pulmonary edema associated with congestive heart failure, distinguishing it from the dry cough pattern of an uncomplicated respiratory infection.