Kennel Cough in French Bulldogs: Signs, Care and Red Flags

Editorial Director: Brandine StrandPublished November 2026 · Sources cited

Sources: AVMA; Liu et al., 2017; Liu et al., 2015.

Your Frenchie comes home from daycare or a weekend at the boarding kennel, and a few days later there’s a loud, goose-like cough that ends in a gag. It sounds alarming, and in a flat-faced dog every breathing sound gets your attention. Kennel cough in French Bulldogs is usually mild and passes on its own, but it deserves a closer eye than it would in a long-nosed breed. Here’s what it is, how it spreads, how integrative vets support a coughing dog at home, what to think about the Bordetella vaccine and exactly when to stop waiting and go.

What Is Kennel Cough in French Bulldogs?

“Kennel cough” is the everyday name for canine infectious respiratory disease complex, or CIRDC. The American Veterinary Medical Association (AVMA) describes it as a highly contagious illness of the airways that any breed or age can catch. It isn’t one germ. Viruses such as canine parainfluenza, canine adenovirus type 2, canine influenza and canine respiratory coronavirus can be involved, along with bacteria such as Bordetella bronchiseptica and Mycoplasma species, and a dog can carry two or more at once (AVMA).

The signs. The classic sign is a sudden, frequent, honking cough that can sound like gagging or retching and may bring up foam. Coughing often gets worse with activity. Other common signs include sneezing and a runny nose or eyes, and not every dog with kennel cough coughs (AVMA). The Merck Veterinary Manual describes the cough as a “goose honk” and says kennel cough should be suspected whenever the characteristic cough suddenly develops 5 to 10 days after exposure (Tonozzi, Merck Veterinary Manual).

How it spreads. Dogs pass it on through close contact, through droplets from coughs and sneezes and through shared toys, bedding, water bowls and even people’s hands. Most dogs are contagious before they show any signs, and some of these germs survive in the environment for weeks (AVMA). Merck notes it spreads rapidly among dogs housed close together, naming kennels, boarding facilities, daycare and veterinary hospitals.

How long it lasts. The AVMA says most cases are mild and dogs fully recover within 7 to 10 days. Merck adds that the cough usually eases over the first 5 days, but the illness persists for 10 to 20 days. Dr. Judy Morgan, an integrative veterinarian, writes that most cases resolve on their own without treatment and are rarely severe unless pneumonia sets in (Morgan, 2018). Dog-to-human spread is extremely rare and has mainly involved people with severely weakened immune systems (AVMA).

Why Flat-Faced Dogs Need Closer Watching

We didn’t find a study showing that kennel cough itself is more common or more severe in French Bulldogs, so we won’t claim it. What we can say is why a coughing Frenchie deserves a sharper eye.

A crowded airway to start with. As our BOAS guide explains, the Frenchie’s short face comes with narrow nostrils, a long, thick soft palate and crowded throat tissue that block airflow, and in research samples about 59% of French Bulldogs were clinically affected by BOAS (Liu et al., 2017).

Breathing changes are easy to miss. In a Cambridge study, 60% of owners failed to recognize breathing disease in Frenchies that tested as clinically affected (Liu et al., 2015). If your dog already snorts and snores, it’s harder to notice when breathing gets worse. Our advice is to learn what your own Frenchie sounds like on a calm, cool day, so you’ll spot a change during an illness.

Some groups get sicker. The AVMA says puppies and older dogs with other health problems face a greater risk of severe disease, and fast or labored breathing can mean bacteria have reached the lungs. Merck notes the illness may progress to bronchopneumonia (a lung infection) in puppies and to chronic bronchitis in weakened adult or aged dogs.

Heat makes it worse. Heat and breathing problems feed each other in flat-faced dogs, so keep a coughing Frenchie cool and calm. Our emergencies and toxins guide covers breathing first aid.

For a bright Frenchie with a mild cough who is eating, drinking and breathing normally between coughs, home care is mostly about rest, comfort and keeping the infection to yourself. Call your vet before you visit, so the clinic can see your dog without exposing other patients (AVMA).

• Rest and calm. The AVMA advises encouraging rest and avoiding excitement. Dr. Peter Dobias also recommends rest, with gentle, low-key walks (Dobias, Kennel Cough in Dogs).
• A harness, not a neck leash. The AVMA advises avoiding neck leashes while a dog recovers. A well-fitted harness keeps pressure off the throat.
• Steam. Dr. Morgan recommends steam from a humidifier or a steamy bathroom (Morgan, 2018). Stay with your dog and keep the room comfortable rather than hot.
• Keep your dog home. The AVMA advises keeping a sick dog away from other dogs until fully recovered. Don’t share bowls, toys or bedding.
• No human cough medicine. Only give medicines your vet prescribes. The FDA lists cough syrup among products that may contain xylitol, which is dangerous for dogs (FDA, 2025).

What integrative vets add. The integrative vets we follow put food and the immune system at the center. Dr. Morgan names foods she says help drain phlegm when there’s nasal discharge or a productive cough, such as clams, thyme and shiitake mushrooms, and also mentions coconut oil and probiotics (Morgan, 2018). A wet cough still means calling your vet now to have your dog seen right away. Dr. Dobias favors a high-quality raw or gently cooked diet.

He suggests avoiding processed foods, dairy and wheat, which he says can increase mucus and congestion in the airways (Dobias, Kennel Cough in Dogs). In 2024, The Natural Pet Doctor, Dr. Katie Woodley’s site, wrote about an unexplained respiratory illness covered in news reports from November 2023. For immune support it pointed to fresh meats, organs, vegetables and fruits, plus probiotics and mushroom-based supplements. It also urged a vet exam for any dog showing signs (The Natural Pet Doctor, 2024).

We share that view: a fresh, whole-food diet is the foundation we recommend for every Frenchie, sick or well. Our gut health guide explains how we approach the microbiome. We don’t give amounts for any food or supplement here, so ask your vet, ideally an integrative one, before adding anything new to a sick dog’s bowl. Natural support is comfort and backup. It never replaces a vet visit when the red flags below appear.

How strong is the evidence? Our rating of the sources cited in this article.

The Bordetella Vaccine Question

Bordetella is the vaccine most people mean when they say “the kennel cough shot.” Both major guideline groups, the World Small Animal Veterinary Association (WSAVA) and the American Animal Hospital Association (AAHA), treat it as a non-core, lifestyle vaccine (Squires et al., 2024; AAHA, 2022). AAHA says these are chosen “based on lifestyle, geographic location, and risk of exposure,” usually yearly.

The AVMA recommends a yearly intranasal vaccine covering Bordetella, canine adenovirus type 2 and parainfluenza for at-risk dogs, such as those in multi-dog settings, and says vaccines reduce illness and its severity and limit spread. In a study of 4.6 million dogs, Bordetella had the lowest rate of reported adverse events after adjusting for other factors (Moore et al., 2023).

The integrative vets we follow are more skeptical of it, and they don’t all agree on the details:

• Dr. Judy Morgan writes that the vaccine doesn’t prevent the disease, though it may lessen symptoms if your dog is exposed, and says she never recommends the injectable form. She considers flat-faced dogs and dogs with a collapsing trachea poor candidates for the intranasal or oral form, advises against giving it within four weeks of surgery or anesthesia and suggests finding facilities that don’t require it (Morgan, 2018).
• Dr. Jean Dodds doesn’t generally recommend it unless the infection is common locally or there’s another high exposure risk. When it’s needed, she prefers the oral form, notes the intranasal form is linked to more adverse events and says to give it on its own at least two weeks before boarding. Where a facility allows it, she prefers signing a waiver. She also notes that none of these respiratory vaccines is 100% effective (Dodds, 2024). WSAVA, by contrast, notes the intranasal form may work better than the oral one (Squires et al., 2024).
• Dr. Gary Richter gives Bordetella only when a facility requires it (Richter, 2023).
• Dr. Peter Dobias stopped offering the kennel cough vaccine in his clinic and suggests facilities offer a liability waiver for clients who choose not to vaccinate (Dobias, Kennel Cough in Dogs).

Our take. This matches our vaccines and titers guide: if your Frenchie stays mostly home, Bordetella may not be needed at all. If your Frenchie boards or goes to daycare, decide on the form and timing with your vet, give it on its own day and keep it well clear of any anesthetic. For the bigger picture on fewer, better-spaced shots, read Are Dogs Over-Vaccinated? What Vets Say for Frenchies.

• Is the Bordetella vaccine worth it to prevent kennel cough in French Bulldogs?WSAVA and AAHA call it a non-core, lifestyle vaccine, and the AVMA recommends a yearly intranasal vaccine for at-risk dogs. Drs. Morgan, Dodds, Richter and Dobias recommend it rarely, only when a facility requires it, or not at all. Our take: skip it for a homebody, and for a boarder or daycare dog, choose form and timing with your vet.
• Intranasal or oral?WSAVA notes the intranasal form may work better than the oral one. Dr. Dodds prefers oral because intranasal is linked to more adverse events, and Dr. Morgan considers flat-faced dogs poor candidates for either. Our take: this is a genuine split, so ask your vet which fits your dog’s airway.

Boarding, Daycare and Kennel Cough Risk

The AVMA puts dogs in kennels, shelters, daycare and other group settings at particular risk, and notes that boarding, training and dog show facilities often require certain vaccines. Because dogs can spread it while looking healthy, a vaccine requirement alone doesn’t make a room of dogs germ-free. A few habits lower the odds:

• Ask before you book. Ask which vaccines the facility requires, whether a waiver is possible and how it handles a coughing dog. Dr. Dobias suggests choosing clean, well-ventilated, low-stress facilities.
• Consider a sitter. During that outbreak, The Natural Pet Doctor suggested avoiding kennels, dog parks and daycare, and using a house sitter instead of boarding where possible (The Natural Pet Doctor, 2024).
• Bring your own bowl. Keep your dog away from other dogs’ toys, food and water bowls (AVMA).
• Watch the news. Stay informed about local outbreaks and consider delaying travel to affected areas (AVMA).
• Go easy with puppies. Dr. Morgan suggests skipping dog parks and doggie daycare until about 4 months, while a young puppy’s immune system is still maturing (Morgan, 2025). Our post on French Bulldog Socialization: How to Do It Safely covers safe ways to build confidence first.

If your Frenchie starts coughing after a stay, keep them home and away from other dogs until fully recovered, and let the facility know.

Most coughs pass. These are the signs that mean your Frenchie needs more than rest at home.

Our tiers, based on the AVMA’s warning signs and our emergencies and toxins guide.

See Your Vet Now: Breathing Trouble Can't Wait

A French Bulldog struggling to breathe, with fast or labored breathing, blue or gray gums, fainting or collapse, needs an emergency vet now. The AVMA says fever, lethargy, poor appetite, a wet cough or fast or labored breathing need immediate veterinary attention, because they can signal that bacteria have reached the lungs.

Keep your dog calm and cool, take off the collar and call ahead so the team can have oxygen ready. Fever, lethargy, poor appetite or a wet cough means calling your vet now to have your dog seen right away, and puppies, seniors and dogs with other health problems should be seen the same day for any cough. Home care and natural support are for mild cases only and never delay care.

Your next step: Today, take a 30-second video of your Frenchie breathing on a calm, cool day so you have something to compare against if a cough starts. If your dog is coughing now, use the red-flag table above, and find a vet near you in our French Bulldog vet directory or our integrative vet directory.

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Frequently Asked Questions About Kennel Cough in French Bulldogs

Sources

1. American Veterinary Medical Association. Canine infectious respiratory disease complex (Kennel cough). Accessed October 14, 2026.
2. Tonozzi CC. Kennel Cough. Merck Veterinary Manual, professional version. Reviewed February 2022; modified September 2024.
3. Liu NC, Sargan DR, Adams VJ, Ladlow JF. Characterisation of brachycephalic obstructive airway syndrome in French bulldogs using whole-body barometric plethysmography. PLOS ONE. 2015;10(6):e0130741.
4. Liu NC, Troconis EL, Kalmar L, et al. Conformational risk factors of brachycephalic obstructive airway syndrome (BOAS) in pugs, French bulldogs, and bulldogs. PLOS ONE. 2017;12(8):e0181928.
5. Morgan J. Kennel Cough. Naturally Healthy Pets. September 12, 2018.
6. Dobias P. Kennel Cough in Dogs: A Complete Guide. peterdobias.com. Accessed October 14, 2026.
7. The Natural Pet Doctor. Navigating Canine Respiratory Illness Naturally. April 29, 2024.
8. U.S. Food and Drug Administration. Paws Off Xylitol; It’s Dangerous for Dogs. Content current as of December 17, 2025.
9. Squires RA, Crawford C, Marcondes M, et al. 2024 guidelines for the vaccination of dogs and cats, compiled by the Vaccination Guidelines Group (VGG) of the World Small Animal Veterinary Association (WSAVA). Journal of Small Animal Practice. 2024;65(5):277–316.
10. AAHA Canine Vaccination Task Force. 2022 AAHA Canine Vaccination Guidelines. American Animal Hospital Association. 2022.
11. Moore GE, Morrison J, Saito EK, et al. Breed, smaller weight, and multiple injections are associated with increased adverse event reports within three days following canine vaccine administration. Journal of the American Veterinary Medical Association. 2023. doi:10.2460/javma.23.03.0181.
12. Dodds WJ. Know Your Bordetella Vaccine. Hemopet. November 3, 2024.
13. Richter G, guest. 5 Ways to Help Your Pet Live Longer (transcript). Starlight Pet Talk. July 25, 2023.
14. Morgan J. The Importance of Canine Socialization. Naturally Healthy Pets. April 2, 2025.

Veterinarians are cited for their published work; their inclusion doesn’t mean they’ve reviewed or endorsed BestFrenchBulldog.com.

This article is for education only and is not veterinary advice. Always talk with your own veterinarian about your dog’s health, and go to an emergency vet now if your Frenchie is struggling to breathe.