Kennel cough in dogs: symptoms, home support and when to see a vet

I remember my first encounter with kennel cough very clearly. I had heard of it, of course, but for years I had rather smugly said that none of my dogs had ever had it. Then one day I came home from work, Faddu walked up to meet me at the gate and sounded like a little pig :). From that sound it was pretty obvious that something was going on in his airways, and I immediately suspected kennel cough.

I brought him straight inside because it was cold outdoors and the coughing fits became worse in the cold air. Luckily, we had our own trusted vet, so I messaged them immediately and checked what we could do at home. Later Peku and Fentu became ill one after another as well. With our four-legged household, that kind of domino effect is honestly not very surprising.

Kennel cough is highly contagious. But there is one important clarification right at the start: kennel cough is not actually caused by one single pathogen. Today the term canine infectious respiratory disease complex, or CIRDC, is used increasingly often because different viruses and bacteria can be involved, often several at the same time.

What is kennel cough, really?

Kennel cough, or infectious tracheobronchitis, is a respiratory infection in dogs whose most typical symptom is a sudden, dry, strong cough that can sometimes sound almost like a goose honk. The disease can involve Bordetella bronchiseptica, canine parainfluenza virus, canine adenovirus-2, canine influenza viruses and other pathogens. The role of mycoplasmas has also been studied, although it is not equally clear in every case.

The Merck Veterinary Manual describes kennel cough as usually mild and self-limiting, although in puppies it can progress to bronchopneumonia and it may be more severe in weakened, older or chronically ill dogs. Stress, poor ventilation, and extreme temperature and humidity can increase susceptibility and the severity of disease.

This is an important point from an integrative perspective, because the question is not only “which microbe?” Attention also goes to the condition of the respiratory mucosa, stress load, ventilation, recovery, overall immune resilience and whether the dog’s body is coping with the infection calmly. That does not mean strong immunity makes infection impossible, but the condition of the host often affects how severely the infection runs its course.

How does kennel cough spread?

Kennel cough spreads mainly through close contact and respiratory droplets released into the air when an infected dog coughs or sneezes. Infection is more likely in places where many dogs spend time close together: boarding facilities, day care, shows, training sessions, shelters, groomers and similar environments.

Some pathogens can also spread via contaminated objects. Shared water bowls, training equipment or other heavily shared items can therefore contribute to transmission. The incubation period depends on the pathogen, but classic kennel cough symptoms often appear a few days after exposure.

If your dog is coughing, it is sensible to avoid contact with other dogs at least during the acute phase. Exactly how long a dog remains contagious depends on the pathogen. With Bordetella, for example, bacterial shedding can continue for weeks after clinical signs have disappeared. That is why it is not honest to give one universal “X days and it is over” number for all kennel cough cases.

Symptoms

The most typical sign is a persistent, dry, harsh cough, often described as a hacking or goose-honk sound. A coughing fit may be triggered by excitement, exercise or mild pressure on the trachea. Some dogs gag at the end of a coughing fit so convincingly that the owner initially thinks the dog is trying to vomit.

• a sudden dry or “honking” cough;
• gagging or coughing up white foamy mucus;
• sneezing, nasal or eye discharge;
• a mild fever or lower-than-usual energy;
• in more severe disease: loss of appetite, marked lethargy, fever, a wetter/productive cough or difficulty breathing.

In a mild case, the dog usually keeps eating and is quite normal between coughing fits. If fever, loss of appetite, breathing difficulty, marked lethargy or a wet/productive cough develops, complications such as pneumonia need to be considered.

Diagnosis and conventional veterinary treatment

Based on the typical cough and a recent exposure history, a veterinarian can often suspect kennel cough clinically. Chest X-rays, PCR testing or respiratory samples may be used when needed, especially if signs are severe, last a long time, or pneumonia and other causes of coughing need to be ruled out.

One point matters here because the old version of this article was too black-and-white: antibiotics are not automatically the treatment for kennel cough because viruses are often part of the disease complex. But that does not mean antibiotics should “definitely never” be used. Merck notes that a mild case with coughing alone usually does not need an antibiotic, while pneumonia or another bacterial complication may make antibiotic treatment entirely appropriate. When needed, the drug should be chosen as specifically as possible.

This actually fits the integrative view quite well: if a dog is bright, eating and has only a mild cough, the body can be given time while recovery is supported. If the clinical picture changes, the plan should change as well. The goal is not to avoid medication on principle, but not to use it when it offers no benefit.

What did we do at home?

Our dogs have had kennel cough several times, and so far we have managed mild cases with home support. This is our experience, not a universal treatment protocol. The most important thing is to watch whether the dog is otherwise alert, eating, drinking and breathing normally, and whether things are moving in the right direction from day to day.

For a coughing dog I use a harness instead of a collar. The trachea is already irritated, and pressure from a leash can trigger another coughing fit. Moderate humidification of the air can also feel soothing, especially in a dry room.

Milk with honey – an old favourite in our house

In our experience, one of the fastest home remedies for soothing the throat has been warm milk with honey. For a German Shepherd-sized dog we have used about 250 ml of milk with roughly half a tablespoon of honey, given a couple of times a day when needed, especially when the cough starts irritating the throat again. In our house this has repeatedly calmed a bad coughing fit quite quickly.

Boiling milk does not remove lactose. If your dog does not tolerate regular milk well, or you do not know how they react to it, use lactose-free milk instead. Honey itself can soothe the throat, and integrative veterinarians including Dr Karen Becker and Dr Judy Morgan use honey as supportive care for coughs.

With raw honey I would keep one precaution: it is not a good choice for puppies under one year of age or for immunocompromised dogs because of the possible presence of botulism spores. In a healthy adult dog, a small amount of honey is generally well tolerated.

Pertussin – recommended by our veterinarian

Yes, the same cough syrup made for children. Our own veterinarian recommended Pertussin for Faddu, and in our experience it helped relieve his cough. I am therefore not removing that recommendation from the article simply because the product was made for people.

However, I would now add important context. Formula Nature Pertussin currently sold in Estonia contains wild thyme extract, sugar, water, glycerol, vitamin C and ethanol, with an alcohol content of 9.5% by volume. Formulations can vary between products. So do not take a random cough syrup and assume it is suitable for a dog.

Our veterinarian’s recommendation concerned a specific Pertussin product and a specific dog. For a small dog, puppy, chronic illness or concurrent medication, I would confirm the dose with a veterinarian rather than simply calculating it from a child’s dose.

Bromhexine – an important clarification

Bromhexine is a mucolytic medicine that helps thin mucus. For Faddu, our veterinarian recommended bromhexine at 2 mg per kilogram of body weight twice daily for 7-10 days. Because each Bromhexine-Grindeks tablet contained 8 mg of active ingredient, that meant quite a pile of tablets for a large dog :).

I checked this again against official veterinary product information, and there is an important clarification: the UK product information for veterinary Bisolvon 10 mg/g powder also gives dogs a bromhexine dose of 2 mg/kg, administered twice daily. The treatment course for that specific product is five days. In other words, our veterinarian’s dose of 2 mg/kg twice daily is not inconsistent with that veterinary dosing information. The main difference is the length of treatment and, of course, the product itself.

This is a good example of why I do not want to give readers the idea of “buy the human tablets at a pharmacy and calculate it yourself”. The same active ingredient can come in different formulations, and the treatment plan depends on the dog and the clinical picture. Faddu’s regimen stays here as the treatment instruction our veterinarian gave for our dog, not as a universal self-medication recipe.

We have one more very good experience with bromhexine. A breeder’s dog was staying with us when kennel cough appeared. Milk with honey and Pertussin did not noticeably help that dog, but after bromhexine was added, the cough improved within a couple of days. That is one dog’s story, not clinical proof, but it is still valuable as part of our practical experience.

What else do integrative veterinarians use?

Dr Karen Becker lists a range of natural supportive options for kennel cough. It is useful to distinguish what they are intended to do: some aim mainly to soothe an irritated throat and cough, some support immune function, and some are used for antimicrobial effects that have been studied more in laboratory work or other contexts than specifically in dogs with kennel cough.

• Manuka honey or another suitable honey to soothe the throat and cough;
• slippery elm to soothe an irritated throat;
• fresh garlic and olive leaf as part of integrative antimicrobial support;
• oregano and oregano oil, which Becker uses for antimicrobial support;
• echinacea preparations, including Esberitox;
• astragalus as part of traditional and integrative immune and respiratory support.

FendaF now has a separate, thoroughly updated article about garlic. It explains the toxicology, the importance of dose and the logic behind integrative use. So I am not going to repeat the “garlic is good / garlic is poison” duel here. A small controlled amount and a large toxic exposure are not the same thing.

What about essential oils?

In the old article, based on Becker’s recommendations, I suggested eucalyptus, lavender and tea tree oil in a diffuser. Becker’s integrative recommendation remains as part of the historical perspective, but with what we know today it needs more context.

The ASPCA stresses that concentrated essential oils can be harmful to animals, and in an animal with respiratory problems it may be sensible to avoid a diffuser altogether. If a diffuser is used, the animal must be able to leave the room freely, oils should not be applied directly to the dog and the concentration should be very low. Concentrated tea tree oil is particularly problematic. I would be even more cautious in homes with cats, birds or animals with respiratory disease.

So I would not put essential oils among the “main treatments” for kennel cough. If someone wants to use them, I would rather do so under the guidance of an integrative veterinarian and with considerable caution.

When is it time to stop experimenting at home?

Our own dogs’ mild cases have improved quickly, but that does not mean every coughing dog should be watched at home for weeks. I would contact a veterinarian sooner if the dog belongs to a higher-risk group or the clinical picture changes.

• breathing becomes difficult, rapid or laboured;
• the dog stops eating or drinking;
• a high or persistent fever develops;
• the dog becomes markedly lethargic or weak;
• the cough becomes wet/productive or there is substantial purulent nasal discharge;
• the dog is a very young puppy, elderly or immunocompromised;
• the cough becomes worse or shows no sign of improvement within about a week.

And one practical point: if a dog is struggling to breathe, that is not the moment to start testing one new syrup, oil or herb after another. The lungs and oxygenation need to be assessed, along with whether pneumonia or another cause of coughing is already involved.

Does having kennel cough provide immunity?

To some extent, recovery may provide pathogen-specific immunity, but the problem with kennel cough is that several different pathogens can be involved. Recovering from one combination does not mean the dog cannot become ill again with another pathogen.

The kennel cough vaccine – this is where views genuinely differ

This is one area where I do not want to write either “the vaccine is pointless” or “the vaccine solves kennel cough”. Both would be too simplistic.

AAHA classifies the Bordetella vaccine as a non-core, risk-based vaccine. In other words, it is not automatically recommended for every dog; the decision depends on lifestyle and exposure risk. A dog that frequently attends boarding, day care, shows or other high-density dog environments has a different risk profile from a dog that lives quietly at home and meets only a few dogs.

The conventional veterinary view is that a Bordetella vaccine can reduce the risk and/or severity of disease caused by that specific pathogen. At the same time, it is also true that kennel cough, or CIRDC, can be caused by many different pathogens and one Bordetella vaccine cannot protect against the entire complex. A vaccinated dog can therefore still develop kennel cough.

Dr Karen Becker does not recommend routine Bordetella vaccination and emphasises the multi-pathogen nature of the disease, the limitations of vaccine protection and individual risk assessment. Dr Judy Morgan is even more critical and considers the benefit small in her own practice compared with the potential adverse effects. These are the positions of specific integrative veterinarians, not a universal scientific consensus.

For me, the most sensible question here is the same as with many non-core vaccines: what is this particular dog’s actual exposure risk, health status and lifestyle? If a boarding facility or training venue requires Bordetella vaccination, that is also a practical factor. If the dog lives a different kind of life, the discussion may be different. A risk-based decision is more meaningful than an automatic “yes” or “no”.

In conclusion

Kennel cough is usually annoying, noisy and highly contagious, but in an otherwise healthy adult dog it is often a mild illness that the body clears on its own. Still, it should not be trivialised, because in puppies and weakened or chronically ill dogs the picture can change quickly, and pneumonia is a real complication.

Our experience has been positive: milk with honey, veterinarian-recommended Pertussin, bromhexine when needed, rest, a warm room and close observation have repeatedly worked well for our dogs. That does not mean the same combination automatically suits every dog. Rather, it means home support has a real place in mild kennel cough when you know what you are watching for and when to change the plan.

Integrative and conventional veterinary approaches do not have to cancel each other out here. One helps us ask how to support the body and respiratory tract. The other helps us judge when diagnostics, antibiotics or other medical intervention are needed. To me, the smartest approach is to use what is genuinely useful for the individual dog from both.

Sources:

• Merck Veterinary Manual. Kennel Cough (Canine Infectious Tracheobronchitis)
• AAHA 2022 Canine Vaccination Guidelines, core and noncore vaccine recommendations
• Bark & Whiskers / Dr Karen Becker. 7 Natural Remedies for Healing Kennel Cough
• Dr Judy Morgan. Kennel Cough
• VMD. Bisolvon 10 mg/g Oral Powder, product information (revised September 2025)
• ASPCA. The Essentials of Essential Oils Around Pets
• PetMD. Can Dogs Eat Honey?
• Formula Nature Pertussin product information (current Estonian retail listing)

 

---

---