Kennel Cough in Dogs: Symptoms, Treatment and Contagion

Kennel cough is the common cold of the dog world: wildly contagious, usually harmless, and capable of producing a noise alarming enough to ruin your night's sleep. The technical name is canine infectious respiratory disease complex, which tells you the important thing straight away: it is not one bug but a team of viruses and bacteria that often arrive together.

Most healthy adult dogs need nothing more than rest and time. But because the same cough can occasionally signal something more serious, it is worth knowing what you are listening to.

What kennel cough actually is

The main players are the bacterium Bordetella bronchiseptica and several viruses, including canine parainfluenza and canine adenovirus. They damage the lining of the windpipe and airways, which is what produces the characteristic cough. Dogs catch it through the air, through shared water bowls and toys, and through nose-to-nose contact, which is why it sweeps through kennels, daycares, training classes and busy dog parks.

The name is unfair to kennels, incidentally. Anywhere dogs gather will do.

The symptoms, in order of appearance

Symptoms typically appear three to ten days after exposure:

1. 1A sudden, dry, honking cough, often compared to a goose. This is the hallmark.
2. 2Retching or gagging at the end of a coughing bout, sometimes producing white foam.
3. 3Coughing triggered by excitement, exercise, or gentle pressure on the throat.
4. 4A mildly runny nose or eyes in some dogs.
5. 5In most cases, nothing else: the dog eats, plays and acts normally.

That last point matters. A dog with classic kennel cough is usually bright and well in themselves. A coughing dog that is also flat, feverish or off its food is a different, more urgent picture.

How long it lasts and how to help at home

Most cases resolve in one to three weeks. The home-care checklist is short but genuinely useful:

• Swap the collar for a harness so nothing presses on the windpipe.
• Rest: no long walks, no rough play, no excitement if you can help it.
• Keep the dog away from smoke, aerosols and dusty rooms.
• Encourage drinking; some vets suggest a little honey in warm water to soothe the throat.
• Keep the dog warm and give them a quiet place to sleep away from other pets.

Kennel cough treatment is mostly a test of the owner's patience. The dog feels fine; it is the noise that is exhausting.

Vets sometimes prescribe anti-inflammatories or cough suppressants for comfort, and antibiotics if a secondary bacterial infection is suspected. Antibiotics do not touch the viral part, which is why they are not automatic.

How contagious is it, really?

Very. An infected dog can spread the bugs from before symptoms appear until roughly two weeks after they start, sometimes longer. During that window:

• No dog parks, daycare, training classes or grooming appointments.
• Walk in quiet areas, on a lead, away from other dogs.
• Do not share bowls, toys or beds with other dogs.
• Tell anyone your dog met recently, so they can watch their own dog.

If you have other dogs at home, separate them as much as is practical and wash your hands between handling them. Many householdmates will already have been exposed by the time the first cough appears, but separation still reduces the dose.

Not sure it is kennel cough?

A honking cough after recent dog contact is fairly distinctive, but a few other conditions sound similar, including a foreign body in the throat, a collapsing trachea (common in toy breeds), and heart disease in older dogs. The checker below weighs the sound, the history and the warning signs.

When it becomes serious

In puppies, seniors, flat-faced breeds like Pugs and French Bulldogs, and dogs with existing health problems, kennel cough can descend into the lungs and become pneumonia. Treat these signs as a prompt vet visit:

• Fever, shivering or marked lethargy
• Loss of appetite
• Faster or laboured breathing between coughing bouts
• A moist, productive cough
• A cough that is still worsening after a week rather than plateauing

The vaccine question

There is a vaccine covering Bordetella and the main viral players, given as nose drops or an injection. It does not prevent every case, because kennel cough is a complex rather than a single germ, but vaccinated dogs typically get a milder, shorter illness. If your dog boards, attends daycare, or goes to classes, most kennels will require it anyway, usually at least two weeks before the stay.

For a healthy adult dog that mostly walks solo, it is a judgement call to make with your vet. For a social butterfly, it is close to a no-brainer.

Kennel cough or something else?

A cough is a symptom, not a diagnosis, and several conditions can sound alike. This table is a guide to the conversation with your vet, not a replacement for it.

The two that should not wait are lungworm and pneumonia. Lungworm, carried by slugs and snails and spreading across the UK, can interfere with blood clotting. Pneumonia can follow kennel cough in puppies, seniors and flat-faced breeds such as the Pug and French Bulldog. If your dog has a cough and is also quiet, off food or breathing fast, call the vet that day.

A dog with kennel cough usually sounds terrible and feels fine. A dog that sounds mild but feels terrible is the one to worry about.

Your recovery plan, day by day

Most uncomplicated cases settle within one to three weeks. The aim is to rest the airway, limit spread and spot complications early.

1. 1Day 1: call your vet to describe the cough; many will advise by phone and ask you to arrive without entering the waiting room. Cancel daycare, grooming and classes.
2. 2Days 1 to 7: switch from collar to harness so nothing presses on the windpipe. Keep walks short, on lead and away from other dogs.
3. 3Throughout: run a humidifier or let your dog sit in a steamy bathroom for ten minutes, which can loosen secretions. Avoid smoke, aerosols and dusty bedding.
4. 4Feed softened food if swallowing seems uncomfortable, and keep fresh water easy to reach.
5. 5Check breathing at rest each evening. A sleeping dog normally takes fewer than 30 breaths a minute. More than that, or effortful breathing, needs the vet.
6. 6Wait for two weeks after the cough stops before returning to group settings, as many dogs continue shedding infection.

Prevention checklist for social dogs

• Discuss the intranasal or injectable kennel cough vaccine with your vet, ideally two to three weeks before boarding
• Keep core vaccinations, including canine parainfluenza and distemper, up to date
• Use your own water bowl rather than communal ones in parks and cafés
• Choose daycares and kennels that require vaccination records and ventilate well
• Keep coughing dogs at home and tell people who have been in contact
• Use a harness for dogs with sensitive airways or a history of tracheal problems

If you are weighing up which dog suits a busy social life, the breed matchmaker includes sociability, and our guide to travelling with a dog covers boarding alternatives.

The verdict, by household

Healthy adult, bright and eating: rest, harness, humidity and isolation from other dogs. Phone your vet if it lasts beyond two to three weeks.

Puppy, senior or flat-faced breed: call the vet early; complications are more likely.

Any dog off food, lethargic or breathing fast: same-day appointment.

Booking kennels soon: vaccinate in good time; protection is not instant.

When to call your vet

Call the same day for a cough with fever, lethargy, reduced appetite, green nasal discharge, fast or laboured breathing, or coughing up blood. Call urgently if gums look pale or blue, or your dog collapses. Seek advice for any cough lasting more than three weeks, any cough in a dog with known heart disease, and any cough in a young puppy.

Kennel cough myths, checked

Honest expectations make recovery easier: a noisy fortnight, a quiet dog and patience usually do the job.