That Honking Cough: What's Going On?
If your dog suddenly starts coughing like they're trying to hack up a goose, you've probably just encountered kennel cough. Technically called infectious tracheobronchitis, kennel cough is one of the most common respiratory infections in dogs. It's named for its frequent spread in kennels and boarding facilities, but your dog can pick it up anywhere dogs congregate — dog parks, grooming salons, vet waiting rooms, training classes, or even passing another dog on a walk.
For most healthy adult dogs, kennel cough is annoying but not dangerous — think of it as the canine equivalent of a chest cold. But for puppies, senior dogs, or dogs with compromised immune systems, it can be more serious. Knowing what you're dealing with helps you respond appropriately.
What Causes Kennel Cough?
Kennel cough isn't caused by a single organism. It's usually a cocktail of viral and bacterial agents working together. The most common players include:
- Bordetella bronchiseptica — the bacterium most commonly associated with kennel cough and the target of the Bordetella vaccine
- Canine parainfluenza virus
- Canine adenovirus type 2
- Canine respiratory coronavirus (not the same as COVID-19)
- Mycoplasma
Often, a viral infection weakens the respiratory tract first, and then Bordetella or other bacteria move in and create the full-blown cough. This combination is why the disease can vary in severity — the specific mix of organisms matters.
How It Spreads
Kennel cough is highly contagious. It spreads through:
- Airborne droplets — when an infected dog coughs or sneezes, respiratory particles travel through the air
- Direct contact — nose-to-nose greetings with an infected dog
- Contaminated surfaces — water bowls, toys, leashes, and human hands can carry the organisms
The incubation period is typically 2-14 days, meaning your dog might pick it up at boarding on Monday and not start coughing until the following week. This delay is why it's so hard to pinpoint exactly where the infection came from.
Enclosed spaces with poor ventilation and lots of dogs are ideal transmission environments — hence the name "kennel cough."
Recognizing the Symptoms
The hallmark symptom is unmistakable once you've heard it:
A dry, honking cough that sounds like a goose honk or like something is stuck in your dog's throat. It often comes in paroxysms — fits of repeated coughing — and may be triggered by excitement, exercise, pressure on the trachea (from a collar), or temperature changes (like going from warm indoors to cold outside).
Other symptoms may include:
- Retching or gagging at the end of a coughing fit (sometimes producing white foam)
- Mild nasal discharge
- Mild sneezing
- Slightly reduced appetite
- Low energy
What's usually NOT present in uncomplicated kennel cough:
- High fever
- Severe lethargy
- Complete loss of appetite
- Difficulty breathing
- Thick, colored nasal discharge
If your dog shows any of those more severe symptoms, the infection may have progressed to pneumonia, and you should see your vet promptly.
When to See the Vet
For a healthy adult dog with a classic honking cough but otherwise normal energy, appetite, and behavior, you might not need to rush to the vet immediately. Many mild cases resolve on their own within 1-3 weeks.
However, see your vet if:
- Your dog is a puppy, senior, or has any underlying health conditions
- The cough persists beyond 2-3 weeks
- Symptoms are worsening rather than improving
- Your dog develops a fever, becomes lethargic, stops eating, or has difficulty breathing
- You see thick, green or yellow nasal discharge
- Your dog is a brachycephalic (flat-faced) breed — these dogs are more vulnerable to respiratory complications
When in doubt, a phone call to your vet can help you decide whether an in-person visit is needed. Describe the symptoms and let them guide you.
Treatment
Most cases of kennel cough in otherwise healthy dogs are self-limiting — they resolve with time and supportive care, much like a human cold.
Your vet may recommend:
- Rest — reducing exercise and excitement to minimize coughing fits
- Cough suppressants — in some cases, your vet may prescribe medication to ease the coughing, especially if it's disrupting your dog's sleep
- Antibiotics — if a bacterial component is suspected or the dog is at risk for secondary infection. Antibiotics won't help the viral components but can address Bordetella and prevent pneumonia.
- Anti-inflammatories — to reduce airway inflammation
At-home supportive care:
- Use a harness instead of a collar to avoid putting pressure on the trachea
- Keep your home humidified — a cool-mist humidifier near your dog's sleeping area can soothe irritated airways
- Keep your dog in a calm, low-stress environment
- Make sure they're drinking enough water
- Avoid smoke, strong fragrances, and other respiratory irritants
Quarantine: Protecting Other Dogs
Because kennel cough is so contagious, you need to isolate your dog from other dogs while they're symptomatic and for at least a week after symptoms resolve. This means:
- No dog parks, daycare, boarding, or grooming appointments
- No playdates with other dogs
- Walk at off-peak times and keep distance from other dogs
- Wash your hands after handling your sick dog before touching other dogs
If you have multiple dogs at home, isolation can be difficult. The other dogs may have already been exposed by the time you notice symptoms. Monitor all your dogs for signs of coughing and consult your vet about preventive measures for housemates.
Prevention: The Bordetella Vaccine
The Bordetella vaccine is the primary preventive tool against kennel cough. It's available in injectable, intranasal, and oral forms. Most boarding facilities, daycares, and grooming salons require it.
Important things to understand about the vaccine:
- It doesn't prevent all kennel cough — because the disease is caused by multiple organisms, the vaccine (which targets Bordetella primarily) reduces risk but doesn't eliminate it. A vaccinated dog can still contract kennel cough, but it's usually milder.
- It needs time to work — the vaccine takes several days to two weeks to provide protection. Getting it the day before boarding isn't ideal.
- It needs regular boosting — typically every 6-12 months, depending on your vet's recommendation and your dog's exposure risk.
Think of it like the flu shot for humans: it doesn't guarantee you won't get sick, but it significantly reduces your risk and the severity if you do.
The Bigger Picture
Kennel cough is usually more alarming to owners than it is dangerous to dogs. That honking cough sounds terrible, and watching your dog gag and retch is distressing. But in the vast majority of cases, it's a temporary nuisance that resolves with basic care and a bit of patience.
The key is knowing when it's more than routine — watching for signs of complications, keeping vulnerable dogs protected, and consulting your vet when symptoms don't follow the expected course. Most dogs bounce back from kennel cough within a few weeks and go right back to their normal selves, ready for the next adventure.