Kennel Cough in Dogs: Causes, Treatment, and Prevention

If your dog suddenly starts making a loud, honking cough that sounds like a goose — especially after being around other dogs — you're probably dealing with kennel cough. While the sound is alarming, this is one of the most treatable respiratory conditions in dogs, and most cases resolve on their own.

What Is Kennel Cough?

Kennel cough, formally known as canine infectious tracheobronchitis, is a highly contagious respiratory infection that inflames the trachea (windpipe) and bronchi (airways leading to the lungs). Think of it as the dog equivalent of a common cold — widespread, uncomfortable, and usually self-limiting.

The name "kennel cough" is somewhat misleading because dogs can catch it anywhere they encounter other dogs — parks, grooming salons, vet offices, or even sidewalk encounters. The name stuck because boarding kennels, where dogs are in close quarters, have historically been common transmission sites.

What Causes It?

Kennel cough isn't caused by a single pathogen. It's typically a combination of:

Bordetella bronchiseptica — the most common bacterial cause. This is the bacterium targeted by the "kennel cough vaccine."

Canine parainfluenza virus — a common viral component that weakens airway defenses, making bacterial infection easier.

Other contributing pathogens:

• Canine adenovirus type 2
• Canine respiratory coronavirus
• Canine influenza virus
• Mycoplasma species

Often, a virus weakens the airway lining first, and then bacteria (especially Bordetella) establish a secondary infection. This combined attack is why the disease can vary significantly in severity.

How Does It Spread?

Kennel cough is airborne — dogs spread it through coughing and sneezing. It can also spread through:

• Direct contact — nose-to-nose greetings with infected dogs
• Contaminated surfaces — water bowls, toys, and fencing at dog parks
• Shared air — enclosed, poorly ventilated spaces (boarding facilities, shelters)

An infected dog can spread the disease before showing symptoms. The incubation period is 3-10 days, meaning your dog can be contagious for several days before that first cough appears.

Recognizing the Symptoms

The hallmark symptom is unmistakable once you've heard it:

The classic honking cough — a dry, forceful cough that sounds like a goose honk. It's often triggered by excitement, pulling on a leash, or gentle pressure on the trachea. Dogs may cough so forcefully that they gag or retch at the end.

Other common symptoms:

• Gagging or retching after coughing bouts
• Clear nasal discharge
• Mild lethargy
• Slightly decreased appetite

In mild cases, the cough is the only symptom. Your dog may seem perfectly fine between coughing episodes — playing, eating, and acting normal.

Warning signs that require a vet visit:

• Cough persisting beyond 10-14 days
• Green or yellow nasal discharge (suggesting secondary bacterial infection)
• Fever (rectal temperature above 103°F/39.4°C)
• Loss of appetite lasting more than 24 hours
• Lethargy or difficulty breathing
• Coughing in a puppy under 6 months or a senior dog

Labrador Retrievers and other social breeds that frequently visit dog parks and boarding facilities tend to encounter kennel cough more often due to exposure.

Home Care for Mild Cases

Most kennel cough resolves without medical intervention in 7-14 days. Here's how to keep your dog comfortable:

Rest — reduce exercise to short, gentle bathroom walks. Avoid excitement that triggers coughing bouts.

Humidity — run a humidifier near your dog's resting area. The moisture soothes irritated airways. A steamy bathroom (run a hot shower with the door closed for 10-15 minutes, then sit in the room with your dog) can provide temporary relief.

Use a harness, not a collar — collars put pressure on the trachea and trigger coughing. Switch to a harness for the duration of illness.

Honey — a half to one tablespoon of raw honey can soothe the throat. Not for puppies under 12 months.

Isolation — keep your dog away from other dogs for at least 14 days after the last cough to prevent spreading the infection. Cancel daycare, postpone playdates, and avoid dog parks.

When Veterinary Treatment Is Needed

See your vet if symptoms are severe, your dog is very young or very old, or the cough hasn't improved within 10-14 days.

Veterinary treatment options:

• Antibiotics (doxycycline or azithromycin) — prescribed when bacterial infection is confirmed or suspected, or in at-risk patients
• Cough suppressants (hydrocodone) — used sparingly when the cough is severe and preventing rest
• Anti-inflammatories — to reduce airway inflammation
• Nebulization — in severe cases, nebulized antibiotics or saline can be delivered directly to the airways

Vaccination: Your Best Prevention

The Bordetella vaccine doesn't prevent all causes of kennel cough (there are too many pathogens involved), but it significantly reduces the risk and severity of the most common bacterial component.

Types of Bordetella vaccine:

• Intranasal — squirted into the nose. Provides fastest local immunity (within 48-72 hours). May cause mild sneezing.
• Oral — given as a liquid by mouth. Similar fast onset.
• Injectable — traditional injection. Takes 1-2 weeks for immunity. May require an initial series of two shots.

Who should be vaccinated:

• Dogs that attend boarding facilities, daycare, or grooming
• Dogs that visit dog parks regularly
• Dogs in training classes
• Any dog with frequent exposure to other dogs

Timing: Most boarding facilities require vaccination. The Bordetella vaccine is part of the recommended schedule — see our complete dog vaccination guide for timing at least 2 weeks before the stay. Annual boosters are standard, though high-exposure dogs may benefit from every 6 months.

For a complete overview of recommended vaccines, see our dog vaccination schedule guide.

Recovery Timeline

Day	What to Expect
1-3	Cough develops, may be most intense
4-7	Cough continues but may start to decrease in frequency
7-14	Gradual improvement; most dogs recover fully
14-21	Lingering cough in some dogs (still normal)
21+	Persistent cough warrants vet reassessment

Potential Complications

In most healthy adult dogs, kennel cough is a nuisance, not a danger. However, complications can occur in:

• Puppies — immature immune systems can't fight infection as effectively
• Senior dogs — compromised immune response
• Dogs with pre-existing conditions — heart disease, collapsed trachea, chronic bronchitis
• Immunocompromised dogs — those on immunosuppressive medications

The most serious complication is progression to pneumonia, which requires aggressive veterinary treatment including hospitalization and IV antibiotics.

When in doubt about your dog's cough, a vet call is always the right move. Kennel cough is usually mild, but your vet can rule out more serious conditions that mimic its symptoms.

FAQ

Can humans catch kennel cough from dogs?

It's extremely rare, but technically possible. Bordetella bronchiseptica can occasionally infect severely immunocompromised humans. Healthy adults are at essentially zero risk.

Can my dog get kennel cough even if vaccinated?

Yes. The vaccine protects against Bordetella, the most common cause, but kennel cough can be caused by multiple pathogens. Vaccinated dogs who do get kennel cough typically have milder, shorter illness.

How long is a dog with kennel cough contagious?

Dogs remain contagious for approximately 10-14 days after symptoms appear. Some dogs continue shedding Bordetella for up to 3 months after recovery. Keep your dog isolated from other dogs for at least 2 weeks after the last cough.

Is kennel cough serious?

For healthy adult dogs, kennel cough is usually mild and self-limiting. It becomes a concern for puppies, senior dogs, and immunocompromised dogs, where it can progress to pneumonia. Any cough lasting more than 2 weeks should be evaluated.

Can kennel cough come back?

Yes. Because multiple pathogens cause kennel cough, recovering from one infection doesn't prevent future infections from different strains. Regular vaccination reduces but doesn't eliminate the risk.