Honestly, the first time I heard it, I thought Mabel was choking.

She was a 10-month-old Lab mix, full of energy and bad decisions. One minute she was fine. The next, she was making this sound—a dry, hacking, almost goose-like honk, that sent me running across the room. I flipped her mouth open, checked her throat, half-convinced she’d swallowed a squeaker toy. Nothing there.

That was my introduction to kennel cough. And I learned fast that this sound, as terrifying as it is, is usually not an emergency.

What is kennel cough, really?

Kennel cough is the common name for canine infectious respiratory disease complex (CIRDC). Think of it like the dog version of a bad chest cold mixed with laryngitis. It’s caused by a cocktail of pathogens — bordetella bronchiseptica is the most famous culprit, but parainfluenza, adenovirus type 2, and mycoplasma can all play a role. Dogs often pick up more than one at a time.

So it spreads the way kids’ colds spread in a daycare. One infected dog coughs or sneezes, and tiny droplets hang in the air. Your dog breathes them in. Shared water bowls, kennel surfaces, leashes, even your own hands can carry it from one dog to another. A 2022 study in Topics in Companion Animal Medicine found that bordetella can survive on surfaces for up to 48 hours, which is longer than most people realize.

The incubation period is usually 3 to 10 days. So if your dog starts coughing a week after that trip to the dog park or the boarding kennel, that’s almost certainly why.

The coughing sound and other symptoms

The hallmark is a dry, hacking cough that sounds like your dog has something stuck in their throat. Many dogs gag or retch at the end of a coughing fit and produce a little white foam. That foamy mucus is normal. It’s not vomit.

In my experience, Mabel would cough maybe four or five times in a row, then seem totally fine. She’d want to play, eat, go for a walk, everything normal, just with these bizarre coughing fits interspersed. That’s the classic presentation.

Other symptoms can include:

  • A runny nose
  • Sneezing
  • Mild lethargy
  • Reduced appetite in some cases

What surprised me was how much the cough varies by the individual dog. Some have a mild tickle for a week. Others sound like they’re hacking up a hairball for a full three weeks. The intensity doesn’t always match the severity.

In mild cases, your dog will still be eating, drinking, and acting normal between coughing fits. That’s a good sign. But in more serious cases, fever, eye discharge, or a wet, productive cough can develop. That’s a sign you may be dealing with something more than simple kennel cough, like early pneumonia.

When to actually panic

A coughing dog that is also struggling to breathe, has blue-ish gums, or refuses to eat for more than 24 hours needs a vet immediately. Not tomorrow. Not after you see how it goes. Trust me on this.

Also, puppies under 6 months old, senior dogs, and brachycephalic breeds (Frenchies, pugs, Boston terriers) are at higher risk for complications. Their airways are already compromised. So kennel cough hits them harder.

How vets diagnose and treat it

Most vets can diagnose kennel cough just from the sound. A history of recent boarding, daycare, or dog park exposure seals it. But if the cough is stubborn or the dog isn’t responding to treatment, they might swab the throat or chest to run a PCR panel. That’s a $150 to $300 test that identifies exactly which pathogens are involved.

Here’s the thing about treatment: most cases are self-limiting. The dog’s immune system clears it in 1 to 3 weeks without any medication at all. I’ve found that’s the hardest part for owners to accept. We want to give our dog something and make it better right now. But kennel cough is like a cold — antibiotics don’t work on viruses, and even the bacterial forms often resolve on their own in a healthy dog.

That said, vets often prescribe cough suppressants when the coughing is keeping the dog (or the owner) awake at night. Temaril-P is a common one, combining an antihistamine with a steroid to reduce inflammation and coughing. Expect to pay around $30 to $60 for a course.

Antibiotics are reserved for cases where bordetella is confirmed and the dog’s having a rough go of it. Doxycycline is the usual choice. It’s effective against bordetella, but it won’t do anything for the viral components of CIRDC.

What you can do at home

A few things make a real difference. Using a harness instead of a collar takes pressure off the trachea and reduces coughing fits dramatically. I switched Mabel to a Gooby comfort harness ($22.99 on Amazon) after her second day of coughing, and the improvement was noticeable within hours.

Running a humidifier near your dog’s sleeping area helps keep their airways moist. A steamy bathroom (run a hot shower for 10 minutes, then sit in there with your dog for 15) works in a pinch. Avoid smoke, candles, and aerosols — anything with strong smells will trigger coughing.

Keep your dog calm. Running and excitement worsen the cough. Short leash walks only, no off-leash craziness, for at least 10 days after the cough resolves.

Preventing kennel cough in the first place

The bordetella vaccine is your best bet. It’s not a core vaccine for every dog, but most vets recommend it for social dogs who go to daycare, boarding, grooming, or parks. There are three versions: injectable, intranasal (squirted up the nose), and oral. The intranasal and oral versions work faster, providing protection in just 3 to 4 days. The injectable takes about two weeks.

A 2021 review in Veterinary Clinics: Small Animal Practice found that the intranasal vaccine provides the strongest mucosal immunity — the first line of defense since bordetella enters through the nose. That matches what most vets I know recommend.

The vaccine doesn’t cover every possible cause of kennel cough. There’s no shot for parainfluenza or mycoplasma. So vaccinated dogs can still get sick. But the disease is usually much milder, and they recover faster.

Boarding facilities and doggy daycares almost always require the bordetella vaccine. Check their rules. Some need proof every 6 months, others annually. The vaccine is cheap — $20 to $40 at most clinics, often less at low-cost vaccine clinics run by pet stores or shelters.

Environmental hygiene matters too

If you’ve had a case of kennel cough in your home, clean everything. Bordetella hates bleach. A 1:32 dilution (half a cup of bleach per gallon of water) kills it on hard surfaces. Wash dog beds and fabric toys in hot water with regular detergent. Kennel cough can hang around on soft surfaces for a surprising amount of time.

I made the mistake of not washing Mabel’s crate pad after her first coughing fit. Three days later, my friend’s dog came over, sniffed the crate, and was coughing within a week. I felt terrible.

Airborne particles in a well-ventilated room are less of a concern after a few hours. But direct contact with contaminated objects can spread it for days.

FAQ

Can humans catch kennel cough from their dog?

The short answer: it’s extremely unlikely in healthy people. Bordetella bronchiseptica is related to the bacteria that causes whooping cough in humans, but the canine strain doesn’t typically infect people unless they’re immunocompromised. Small children, the elderly, and anyone undergoing chemotherapy should avoid close contact with a coughing dog until they’re clear. And honestly, I’d suggest running that past your own doctor if you’re worried.

How long is kennel cough contagious?

Dogs are usually contagious for 10 to 14 days after symptoms appear. But some dogs can shed the bacteria for weeks or even months after they stop coughing, especially if they were never treated with antibiotics. That’s why boarding facilities want a clean bill of health on paper before they’ll take your dog back. A good rule: keep your dog away from other dogs for at least two weeks after the cough stops.

Mabel’s cough lasted nine days. She felt fine by day seven, but I kept her home for another week anyway. Was I being overly cautious? Maybe. But the woman at the park whose dog I might have infected would have disagreed if I’d let her out early. Better safe.

One last thing. If your dog is coughing and you’re not sure why, take a video. Seriously. Dogs rarely cough on command at the vet’s office. They get nervous, they stop coughing, and you look like the owner who cried wolf. A 30-second clip of that honking cough will save your vet a lot of guesswork and save you a lot of worry. Record it, bring it, and let the pros tell you what to do next.

Disclaimer: This article is for informational purposes only and does not constitute veterinary advice. Always consult with a licensed veterinarian for medical concerns about your pet.