Your dog came back from the boarding kennel three days ago, and now there’s this cough. A dry, honking cough, like something’s stuck in their throat. They’re eating fine, playing fine, but that cough won’t stop. If this sounds familiar, your dog has likely picked up kennel cough one of the most common, and most contagious, illnesses in dogs.

Key Takeaways

• Kennel cough is a highly contagious airway infection, usually caused by a mix of bacteria and viruses, most often Bordetella bronchiseptica.
• The hallmark sign is a harsh, dry, honking cough, sometimes ending in gagging or retching, while your dog otherwise seems fine.
• Most healthy adult dogs recover on their own within one to three weeks with rest and home care.
• Puppies, senior dogs, and dogs with weak immunity can develop complications like pneumonia, so they need closer vet monitoring.
• Vaccination, usually as an intranasal or oral dose, reduces the risk and severity but doesn’t guarantee your dog will never catch it.

What Is Kennel Cough?

Kennel cough, known to vets as infectious tracheobronchitis, is inflammation of your dog’s upper airway the trachea (windpipe) and bronchi (the airways leading into the lungs), resulting from an inflammation of the upper airways. It spreads rapidly wherever dogs are housed close together boarding kennels, daycare centres, grooming parlours, shelters, even busy veterinary waiting rooms, and it spreads rapidly among susceptible dogs housed in close confinement, such as veterinary hospitals or kennels. Any Indian city with active dog parks, group walks, or community strays mixing with pets creates the same conditions.

For most dogs, kennel cough behaves like a bad cold unpleasant but short-lived. In a small number of cases, though, it can turn serious. In puppies, it can progress to fatal bronchopneumonia, and in older or already unwell dogs, it can settle into chronic bronchitis, since it can progress to fatal bronchopneumonia in puppies or to chronic bronchitis in weakened, ill, or aged dogs. That’s the reason vets treat this “mild” disease with more caution than the name suggests.

What Causes Kennel Cough?

Kennel cough is rarely caused by just one germ. It’s usually a mix of viral and bacterial organisms attacking the airway together, since a number of viral and bacterial organisms can cause kennel cough, and it is common to have infections with more than one of these organisms at the same time. The most frequently involved organisms include:

• Bordetella bronchiseptica — the bacterium most strongly linked to kennel cough, and often the primary cause in puppies under six months old
• Canine parainfluenza virus (CPIV)
• Canine adenovirus type 2 (CAV-2)
• Canine influenza virus, in some regions
• Secondary bacteria such as Pseudomonas, E. coli, and Klebsiella, which can move in after the initial viral damage to the airway lining

Bordetella bronchiseptica can act as the primary cause, especially in young puppies, while other bacteria more often cause secondary infections once the virus has already damaged the airway, since Bordetella bronchiseptica may act as a primary pathogen, especially in dogs under 6 months old, while it and other bacteria may cause secondary infections after viral injury to the respiratory tract.

Symptoms of Kennel Cough in Dogs

The classic sign every pet parent recognises is the cough itself dry, harsh, and often startling the first time you hear it. Bold key signs to watch for:

• A dry, honking cough that can sound like the dog is choking
• Retching or gagging right after a coughing fit, sometimes bringing up white foam
• Cough that worsens with excitement, exercise, or pulling on the leash
• Mild sneezing or a runny nose in some dogs
• Normal to slightly reduced appetite, with energy staying largely normal between coughing episodes
• In more serious cases: fever, lethargy, loss of appetite, or laboured breathing these need same-day vet attention

Most dogs with kennel cough act completely normal between coughing episodes, which is a useful clue. If your dog is coughing but still eating, playing, and wagging their tail, it’s likely uncomplicated kennel cough. If they seem genuinely unwell off their food, tired, feverish treat it as a bigger concern and get them examined promptly.

How Long Does Kennel Cough Last?

In healthy adult dogs, kennel cough usually clears up within one to three weeks without any specific treatment. Vets often describe it as a disease that “improves on its own” in otherwise healthy dogs, calling it a mild disease that normally improves on its own. Puppies, senior dogs, and dogs with existing health issues can take longer to recover and are more likely to need medical support along the way.

How Vets Diagnose Kennel Cough

There’s no single blood test that confirms kennel cough. Vets typically diagnose it based on:

If your dog’s cough doesn’t fit the typical pattern, or if there are signs of a more serious illness, your vet may recommend chest X-rays or bloodwork to rule out pneumonia, heart disease, or other causes of chronic cough.

Treatment: What Helps a Dog With Kennel Cough

Treatment depends entirely on how sick your dog actually is.

• Rest, not restriction. Skip strenuous walks and excitement for a week or two — barking and pulling on the collar make the cough worse. A harness instead of a neck collar reduces pressure on an already irritated airway.
• Isolation from other dogs. Kennel cough spreads through airborne droplets and direct contact, so keep an affected dog away from other pets for at least two weeks.
• Humidified air. Steam from a hot shower or a room humidifier can loosen secretions and ease coughing.
• Cough suppressants. For a persistent, dry cough, vets may prescribe a codeine-containing suppressant to break the cycle and let the airway settle, since a persistent, dry cough may be controlled by a prescribed cough suppressant that contains codeine.
• Antibiotics. Not always needed, but prescribed if a bacterial component or secondary infection is suspected.
• Hospitalisation. Reserved for dogs that progress to bronchopneumonia — this involves IV fluids, antibiotics, oxygen support, and close monitoring, and it’s a real medical emergency rather than routine kennel cough care.

Never give your dog human cough medicine without a vet’s direction. Many common over-the-counter formulas aren’t safe for dogs and won’t address what’s actually going on in their airway.

Kennel Cough Vaccination in India

Vaccination against kennel cough is usually called the Bordetella vaccine, though it may include protection against parainfluenza and adenovirus as well, depending on the formulation your vet uses. It comes in three forms intranasal drops, an oral squirt, or an injectable shot with the intranasal route building protection fastest, often within 48 to 72 hours.

A few things worth knowing before you vaccinate:

• It’s considered a non-core vaccine not mandatory for every dog, but strongly recommended if your dog visits boarding facilities, grooming parlours, training classes, or dog parks regularly.
• Puppies can often start as early as six to eight weeks of age, with your vet deciding the exact schedule based on the vaccine type used.
• Boosters are typically needed annually, or every six months for dogs with frequent group exposure, such as those boarded often or living in multi-dog households.
• Vaccinated dogs can still catch kennel cough, since no vaccine covers every possible cause but symptoms are usually milder and shorter when it happens.
• If you’re planning to board your dog, ask about kennel cough vaccination requirements in advance most facilities in Indian metros now ask for proof before accepting a dog.

When to See a Vet Immediately

Don’t wait it out if your dog shows any of these signs:

• Breathing that looks laboured or rapid even at rest
• A fever, or noticeable lethargy and loss of appetite
• A cough that lasts beyond three weeks
• Coughing up thick discharge, blood, or greenish mucus
• Any of these signs in a very young puppy or a senior dog with existing health issues

Frequently Asked Questions

Is kennel cough contagious to humans? 
No, kennel cough does not infect humans. It spreads between dogs, and in some cases between dogs and cats, but it isn’t a zoonotic risk to people in the household.

Can indoor-only dogs get kennel cough?
Yes. While the name suggests kennels are the only risk, dogs can pick it up from a walk, a vet visit, or even close contact with another pet in the house who is already infected.

Does the kennel cough vaccine guarantee my dog won’t get sick?
No vaccine offers complete protection, since kennel cough can be caused by several different organisms and most vaccines only cover the most common ones. Vaccinated dogs that still catch it typically have milder, shorter illness than unvaccinated dogs.

How soon after boarding does kennel cough show up?
Signs commonly appear within a few days to about a week after exposure. If your dog starts coughing shortly after a boarding stay, grooming visit, or dog park trip, kennel cough is a reasonable first suspicion.

Should I isolate my dog from other pets at home?
Yes, where possible. Kennel cough spreads easily through the air and by direct contact, so keeping an infected dog’s bedding, bowls, and toys separate and limiting close contact with other pets for about two weeks reduces the chance of spreading it further.

References

1. Merck Veterinary Manual — Kennel Cough (Infectious Tracheobronchitis) in Dogs
2. Merck Veterinary Manual — Tracheobronchitis (Bronchitis) in Dogs
3. Merck Veterinary Manual — Kennel Cough — Respiratory System (Professional Content)