Understanding Kennel Cough in Dogs (Vet-Approved Guide)
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Kennel cough is a highly contagious upper-respiratory infection in dogs caused by a mix of viruses and bacteria.
When I see this in clinic, the hallmark sign is a sudden, dry, honking cough that sounds like a goose-honk or as if something is stuck in the throat. Most healthy adult dogs recover in one to three weeks.
It is the most common reason a healthy dog suddenly starts coughing after boarding, day care, or the dog park. Most cases stay mild. Puppies, seniors, and immunocompromised dogs can progress to pneumonia.
If your dog has just started coughing, this guide walks through what to watch for, how to treat it, and when it's time to call the vet.
- The classic kennel cough sound is a dry, honking cough, not wet or productive
- Most healthy adult dogs recover in one to three weeks without antibiotics
- Puppies under six months and senior dogs face the highest risk of complications
- The C5 vaccine covers the most common bacterial cause, Bordetella bronchiseptica
- See a vet if the cough lasts beyond a week, your dog stops eating, or you hear laboured breathing
What Is Kennel Cough?
Kennel cough is the everyday name for canine infectious respiratory disease complex, a contagious illness that inflames the airways and triggers a dry, hacking cough.[2]
A Common Name for a Group of Infections
Vets often call it canine cough or CIRDC. The label changes, but the illness is the same: a respiratory infection caused by several viruses and bacteria that can hit the airways together. [1]
Because more than one pathogen is usually involved, vaccination reduces risk but does not remove it entirely.
The infection spreads through respiratory droplets when dogs cough or sneeze, and through contaminated water bowls, toys, bedding, and grooming equipment. [2] Dogs that mix with others at parks, day care, kennels, training classes, and grooming salons are the most exposed.
How Common is it in Australia?
Kennel cough is one of the most frequently diagnosed respiratory infections in Australian companion dogs. Outbreaks cluster around summer holiday boarding periods and Christmas, when boarding facilities are full, and dogs mix more than usual.
Australian boarding kennels, day cares, and grooming salons commonly ask for proof of C5 vaccination before accepting a dog. That requirement reflects how easily the infection moves through a busy facility.
What Causes Kennel Cough?
Kennel cough is usually caused by a combination of two or more pathogens hitting the airways at once.
Bordetella Bronchiseptica
Bordetella is the most common bacterial cause and the one targeted by kennel cough vaccines, particularly in dogs under six months old. It often turns up alongside a virus that weakens the airway first, letting the bacteria take hold.
Bordetella can survive on surfaces such as water bowls, toys, and grooming tools, which is why outbreaks can spread quickly through a shared facility.
Canine Parainfluenza Virus and Other Viruses
Canine parainfluenza virus is one of the most common viral components of kennel cough. Canine adenovirus type 2 also contributes, and some outbreaks involve canine influenza, mycoplasma, or canine herpesvirus. [1]
The mix of pathogens involved varies between outbreaks, which is why a vaccinated dog can still catch a mild case.
How It Spreads
Kennel cough moves between dogs in four main ways:
- Airborne droplets from coughing or sneezing
- Direct nose-to-nose contact at parks or day care
- Shared bowls, toys, kennels, and grooming equipment
- Hands and clothing of people who handle multiple dogs
Infected dogs can keep shedding Bordetella for weeks to months after the cough has cleared, which is why isolation periods are important.
"That harsh, honking cough can be scary to hear, but kennel cough is usually mild and clears up on its own within a week or two. Keep an eye on your dog's energy and appetite—if they go off their food, seem unusually flat, or the cough drags on past two weeks, it's worth a visit to your vet to make sure nothing more serious is going on."
Dr Jack Ayerbe OAM
Veterinarian & Vets Love Pets Partner
Symptoms of Kennel Cough
The signature sign is a sudden, dry, honking cough, but several other symptoms can appear alongside it.
What Kennel Cough Sounds Like
The cough is dry, forceful, and often described as a goose-honk. Many owners think their dog has something stuck in the throat, and coughing fits often end with a gagging or retching motion that brings up white foam rather than mucus. [4]
Coughing is usually triggered by pressure on the trachea, excitement, exercise, pulling on a lead, or going out in cold air. A dog who coughs hardest right after a walk or play session is showing a classic kennel cough pattern.
Other Signs to Watch For
Alongside the cough, some dogs show:
- Reverse sneezing or noisy breathing
- Mild nasal discharge
- A low-grade fever
- Reduced appetite or energy
- Watery eyes
Most dogs stay bright, eat normally, and act normally. That's part of what makes mild kennel cough so recognisable.
Signs of a More Serious Infection
Some signs suggest the infection has moved beyond a mild upper-respiratory case. Watch for:
- Coughing that produces mucus or sounds wet
- Lethargy lasting more than a day
- Refusal to eat or drink
- Fast, laboured, or shallow breathing
- Blue or pale gums
Any of these points may indicate possible pneumonia or a deeper infection and need same-day veterinary attention.
Treating Kennel Cough
Most uncomplicated cases resolve with rest, hydration, and time. Antibiotics are reserved for confirmed bacterial cases or high-risk dogs.
Veterinary-led Care
Your vet will decide on treatment after listening to the cough, checking your dog's temperature, and looking for signs of deeper infection.
Options can include:
- Antibiotics if Bordetella is suspected or symptoms worsen
- Cough suppressants for severe, persistent coughing
- Anti-inflammatories if the airways are irritated
- Chest x-rays if pneumonia is a concern
In an otherwise healthy adult dog with a mild case, the most useful prescription is often rest.
Antibiotics are not the default treatment for kennel cough. Most cases are viral or self-limiting, and routine antibiotic use can drive resistance without speeding recovery. Your vet will reserve them for cases where bacterial involvement is likely, or where a high-risk dog needs extra cover.
Supportive Care at Home
- Rest your dog for at least seven to ten days, even if they seem to be recovering
- Swap a collar for a harness during recovery. Pressure on the trachea is one of the most reliable triggers for the cough, so any lead pulling that presses on the throat makes things worse. Browse vet-recommended dog harnesses for a fit that sits clear of the windpipe
- Offer wet dog food or soften kibble with warm water if swallowing seems uncomfortable
- Keep the home smoke-free and well-ventilated
Isolate your dog from other pets for at least two weeks after the cough clears, since shedding can continue without obvious symptoms.
Prevention and Long-Term Management
The C5 vaccine is the most effective single tool, but reducing exposure matters just as much.
The C5 Vaccination
C5 combines the core C3 vaccine, which covers distemper, hepatitis, and parvovirus, with parainfluenza and Bordetella protection.
It is the standard option in Australia for dogs that mix in social settings, and most boarding kennels, day cares, and groomers ask to see proof of vaccination before accepting your dog.
C5 is available as an intranasal drop or an injection in Australia, and the intranasal form can also be administered into the mouth using an applicator.
Your vet will recommend the format that suits your dog's age, history, and exposure risk. Annual boosters are typical, although the schedule can be tailored to your dog. [2]
Reducing Exposure in Social Settings
Vaccination is the foundation, but a few habits lower risk further:
- Choose boarding and day care that require up-to-date vaccination certificates
- Bring your own water bowl to dog parks and meet-ups
- Avoid sharing toys and treats between unfamiliar dogs
- Step away from any dog who is coughing, even if the owner says it is "just allergies"
Building General Respiratory Resilience
A healthy dog handles respiratory infection better than a struggling one. The basics matter:
- Maintain a healthy weight to reduce airway strain
- Keep up with vet-recommended parasite protection and regular dental care for dogs
- Manage stress in multi-dog households or during travel
- For puppies under six months and senior dogs with mobility or health issues, book in for extra check-ups during peak exposure seasons
When to See a Vet
Most cases are mild, but a short list of warning signs means it's time to book in.
Knowing when to act on a cough is one of the hardest parts of pet ownership. Book a vet visit if your dog shows any of the following:
- Cough lasting longer than seven to ten days, or worsening at any point
- Coughing that brings up mucus rather than white foam
- Refusal to eat or drink for more than 24 hours
- Lethargy, fever, or noticeable weight loss
- Fast, shallow, or laboured breathing
- Pale or blue-tinged gums
- Any cough in a puppy under six months, a senior dog, or a dog with existing health conditions
These signs can indicate pneumonia or a more serious infection and need prompt treatment. If you are unsure, ring your clinic and describe the cough. Most reception teams can triage over the phone and get you in the same day if needed.
Kennel Cough FAQs
How long does kennel cough last?
Most healthy adult dogs recover from kennel cough within one to three weeks. The cough often peaks in the first week and tapers gradually. Puppies, seniors, and immune-compromised dogs can take longer and are more likely to need veterinary support. If the cough is still strong after seven to ten days, book a check-up.
Is kennel cough contagious to humans?
Kennel cough is very rarely transmitted to humans, and almost never to healthy adults.
A small number of cases of Bordetella bronchiseptica have been reported in severely immunocompromised people, so people undergoing chemotherapy, on immunosuppressive medication, or with chronic lung disease should take extra care around an infected dog and speak to their GP if they have concerns.
Can cats catch kennel cough from dogs?
Cats can catch Bordetella bronchiseptica, the same bacteria that causes kennel cough in dogs. Cats in the same house rarely catch it, but it's worth being careful. Keep an infected dog separate from cats during illness and for at least two weeks after symptoms clear. Watch cats for sneezing, runny eyes, or a change in appetite. Kittens are most at risk, and our vet's kitten guide covers early-warning signs in young cats.
Can dogs die from kennel cough?
Kennel cough is rarely fatal in otherwise healthy adult dogs. Deaths almost always occur when the infection progresses to pneumonia in a high-risk dog, such as a young puppy, a senior, or a dog with an existing heart or lung condition. Early veterinary care for any worsening cough, breathing change, or loss of appetite is what keeps the risk low.
How long is a dog with kennel cough contagious to other dogs?
A dog with kennel cough is typically contagious from a few days before symptoms appear until at least two weeks after the cough has cleared. Shedding of Bordetella bronchiseptica drops to barely-detectable levels by about six weeks after a dog first picks it up, but in some cases shedding can continue for up to three months. Keep your dog away from boarding, day care, parks, and unfamiliar dogs for the full two-week minimum after recovery.
Most dogs come through kennel cough well, especially when their owners catch the signs early and give them the rest they need. If the cough is mild and your dog is bright, supportive care at home is usually enough.
If anything feels off, or your next boarding stay is on the calendar, book in with your vet for a check.
Veterinarian & Vets Love Pets Partner
BVSc
Dr Jack Ayerbe OAM is a distinguished Geelong veterinarian with over 50 years of experience, the founder of Newtown Veterinary Practice, and a dedicated advocate for animal welfare and ethics.
More articles from Dr Jack AyerbeReferences
- MSD Veterinary Manual. Kennel Cough — Respiratory Diseases of Small Animals. msdvetmanual.com
- American Veterinary Medical Association. Canine infectious respiratory disease complex (Kennel cough). avma.org
- Greencross Vets. Kennel Cough (Canine Cough) in Dogs. greencrossvets.com.au
- Veterinary Partner (VIN). Kennel Cough in Dogs. veterinarypartner.vin.com
- Wikipedia. Kennel cough. en.wikipedia.org/wiki/Kennel_cough
- Elwood Veterinary Clinic. Kennel Cough. elwoodvet.net/kennel-cough
- MSD Veterinary Manual. Feline Respiratory Disease Complex. msdvetmanual.com
