The hallmark symptom of kennel cough is a forceful, dry cough that sounds like a goose honking. It often comes in fits and may be followed by retching or gagging, which can make it look like your dog is trying to vomit something up. Most dogs with kennel cough stay alert and keep eating normally, but the cough itself can be persistent and alarming to hear.
What the Cough Sounds Like
The “goose honk” quality is what sets kennel cough apart from other types of dog coughs. It’s a harsh, dry, hacking sound that can carry across a room. Many owners initially think their dog has something stuck in their throat because of the retching and gagging that follows a coughing fit. Unlike a wet, phlegmy cough, this one sounds hollow and forceful.
Coughing episodes are often triggered by excitement, physical activity, or pressure on the throat. If your dog pulls against a leash or collar and immediately starts coughing, that’s a common pattern with kennel cough. Drinking water, barking, or even a change in air temperature can also set off a round of hacking.
Other Common Symptoms
Beyond the distinctive cough, most mild cases don’t produce dramatic symptoms. Your dog may have a slightly runny nose with clear discharge, occasional sneezing, or watery eyes. Many dogs remain playful and eat normally throughout the illness, which is one reason owners sometimes delay recognizing it as an infection. The cough is often the only obvious sign.
Some dogs do become mildly lethargic or show a slightly reduced appetite, especially during the first few days when the cough is at its worst. This is generally not cause for alarm on its own, as long as your dog is still drinking water and perking up between coughing episodes.
How Quickly Symptoms Appear
After exposure, symptoms typically take 3 to 14 days to show up. This incubation window means your dog may have picked up the infection well before the first cough. If your dog was at a boarding facility, groomer, dog park, or training class within the past two weeks, that’s the likely source. Dogs are contagious during this period even before symptoms start, which is why the infection spreads so efficiently in group settings.
Once the cough appears, it usually lasts 1 to 3 weeks. Most dogs recover at home without medication. The cough tends to be worst in the first week, then gradually becomes less frequent before resolving entirely.
Signs the Infection Is Getting Worse
In a small number of cases, the infection moves deeper into the lungs and develops into pneumonia. This is the main complication to watch for, and the symptoms are noticeably different from a straightforward case of kennel cough.
- The cough changes character. Instead of a dry honk, it becomes wet and productive, as if your dog is bringing up mucus.
- Nasal discharge turns thick or colored. Clear, watery discharge is typical of mild cases. Green, yellow, or cloudy discharge suggests a bacterial infection has taken hold.
- Fever develops. A dog’s normal temperature runs between about 101°F and 102.5°F. High fever alongside a worsening cough is a red flag.
- Breathing becomes labored. Rapid breathing at rest, visible effort when inhaling, or flared nostrils all point to lung involvement.
- Your dog stops eating or becomes listless. A dog that loses interest in food, won’t get up, or seems depressed has moved beyond a mild respiratory infection.
Pneumonia from kennel cough requires veterinary treatment. If you notice any combination of these signs, especially labored breathing or a high fever, don’t wait to see if it resolves on its own.
Dogs at Higher Risk for Complications
Puppies, senior dogs, and dogs with weakened immune systems are more likely to develop pneumonia from what starts as a routine case of kennel cough. Puppies haven’t built up full immune defenses yet, and older dogs may not fight off the infection as efficiently. Flat-faced breeds like bulldogs and pugs, which already have compromised airways, can also struggle more with respiratory infections.
For healthy adult dogs, kennel cough is roughly comparable to a human cold: unpleasant and contagious, but self-limiting. For vulnerable dogs, the same infection can escalate quickly, so closer monitoring matters.
How to Tell It Apart From Other Conditions
A honking cough in dogs isn’t exclusive to kennel cough. Tracheal collapse, a condition where the airway partially flattens during breathing, produces a similar goose-honk sound and is also triggered by excitement, pulling on a leash, or changes in temperature. The key difference is timing: kennel cough comes on suddenly after social exposure and resolves in a few weeks, while tracheal collapse is a chronic, recurring problem most common in small and toy breeds.
Heart disease can also cause coughing in dogs, particularly at night or after lying down. If your dog’s cough has been going on for more than three weeks, started without any obvious exposure to other dogs, or is accompanied by exercise intolerance and fainting, those patterns suggest something other than kennel cough. A vet can distinguish between these conditions with a physical exam and, if needed, imaging.