Kennel cough in dogs – causes, symptoms, transmission, treatment and prevention

The term "kennel cough" in dogs causes concern for many dog ​​owners. As soon as your dog suddenly starts coughing, perhaps dryly, barking, or with a gagging sound, the worry quickly arises that it could be a contagious disease. Indeed, kennel cough is one of the most common infectious respiratory diseases in dogs. The risk of infection is particularly high in places where many animals come together – such as animal shelters, boarding kennels, dog training schools, dog shows, or dog sports.

In this comprehensive guide, you'll learn everything you need to know about kennel cough, also known as infectious tracheobronchitis or canine flu. We clarify the term, explain the causes and pathogens, describe typical symptoms, discuss transmission and risk factors, and show you how treatment works. You'll also learn about the role of vaccination and how you can best protect your four-legged friend in everyday life.

What is kennel cough in dogs?

Kennel cough is the colloquial term for a complex of upper respiratory tract infections in dogs. Medically, it is called infectious tracheobronchitis. The term itself describes the condition: an infectious inflammation of the trachea and bronchi. It is not a single disease, but rather an infectious disease that can be caused by various viruses and bacteria.

The name kennel cough originates from a time when the disease primarily occurred in kennels, i.e., in the close confinement of many dogs. Today, we know that kennel cough can develop in dogs anywhere there is contact with other dogs. Even brief sniffing is often enough to transmit the infection.

Kennel cough is usually benign, but its severity can vary depending on the cause, the dog's immunity, and its overall health. In some cases, complications such as pneumonia or a secondary infection can occur.

Why is kennel cough so contagious?

Kennel cough is a highly contagious disease in dogs. This is due to the way it is transmitted. The pathogens are primarily spread through droplet infection. When a dog coughs, sneezes, or barks, tiny droplets containing viruses or bacteria are released into the air. Other dogs then inhale these droplets or inhale them through their mucous membranes.

Indirect contact also plays a significant role. Dog toys, water bowls, leashes, collars, or even people's clothing can transmit pathogens. The risk of infection increases considerably, especially in enclosed spaces with poor air circulation.

Contact with other dogs is therefore the most important risk factor. Dog training schools, dog sports, boarding kennels, animal shelters, and dog shows are considered classic places where kennel cough spreads quickly among dogs.

What pathogens cause kennel cough?

Kennel cough is not caused by a single pathogen, but by an interaction of various viruses and bacteria. Therefore, it is also referred to as a disease complex.

The most important viruses include:

• Canine Parainfluenza Virus (CPIV, also called CPIV 2)

• Canine adenovirus type 2 (CAV 2)

• Herpes virus or herpesvirus

• Reovirus

• Morbillivirus

• Para Influenza Virus

These viruses attack the mucous membranes of the respiratory tract and weaken the local defenses. This paves the way for bacterial pathogens.

The most common bacteria include:

• Bordetella bronchiseptica

• Mycoplasmas

Bordetella bronchiseptica plays a particularly important role and is one of the most well-known pathogens causing kennel cough in dogs. In many cases, a mixed infection of viruses and bacteria is present. This interplay is precisely what makes the course of the disease so variable.

Cause and development of the disease

The cause of kennel cough is always a respiratory infection. However, whether your dog actually becomes ill depends on several factors. The immune system plays a central role. A healthy dog ​​with a robust immune system can often ward off pathogens without developing symptoms. However, if the immune system is weakened, the risk increases significantly.

Possible reasons for a weakened immune system include:

• Stress, for example due to a stay in pet boarding facilities or animal shelters

• Many new impressions, for example at dog shows or in dog sports

• Young age, as puppies do not yet have full immunity

• Previous respiratory illnesses

• Cold, drafts and damp air

• Poor hygiene in communal facilities

Mechanical pressure on the neck, such as from a collar that is too tight or strong pulling on the leash, can also intensify the urge to cough and irritate the mucous membranes. While this is not the cause of the illness itself, it can worsen the symptoms.

Typical symptoms of kennel cough in dogs

The primary symptom of kennel cough is a cough. It usually comes on suddenly and often sounds dry, barking, or choking. Many owners describe it as if the dog has something stuck in its throat. It is also typical for the dog to stretch its neck or gag while coughing.

Common symptoms include:

• Dry, harsh cough

• Coughing sensation when pressure is applied to the throat

• Gagging, sometimes with expectoration of mucus

• Tonsil irritation

• Mild nasal discharge

• Exhaustion

• Fever

• Reduced appetite

In mild cases, a cough remains without further symptoms. In more severe cases, the dog's overall condition can deteriorate significantly. Puppies, older dogs, and animals with pre-existing conditions are particularly at risk of developing bronchitis or even pneumonia.

Course and possible complications

The course of kennel cough in dogs varies greatly. In many cases, the illness heals completely within one to three weeks. This is provided that your dog is rested and no additional infection develops.

Problems arise when a secondary infection develops. Bacteria can then spread in the lower respiratory tract. Bacterial bronchitis or pneumonia are possible consequences. Typical symptoms include high fever, severe fatigue, shortness of breath, and a wet cough.

Chronic cases are also possible, especially if the dog repeatedly comes into contact with infected members of its species or if its immune system is permanently weakened.

Contagion: How does kennel cough spread?

Infection occurs primarily through droplet transmission. When a dog coughs, pathogens are released into the air and can be inhaled by other dogs. Close contact, such as during play, sniffing, in kennels, or sharing a water bowl, also increases the risk. Generally speaking, the risk of infection is particularly high when many dogs are in close proximity.

Dogs can infect each other, as well as cats. Humans can also transmit pathogens indirectly. While kennel cough is not a disease that can be transmitted to humans, clothing, hands, or shoes can spread viruses and bacteria. Good hygiene is therefore especially important if you have contact with multiple dogs.

A dog can be contagious even before the first symptoms appear. Even after the cough subsides, pathogens can still be shed for some time. Therefore, as a general rule, dogs with kennel cough should have no contact with other dogs for at least one to two weeks.

Diagnosis and examination at the veterinarian

If your dog is coughing, you should observe them carefully. If the cough lasts longer than a few days, if their condition worsens, or if fever and lethargy develop, a visit to the vet is advisable.

Kennel cough is usually diagnosed based on the symptoms and medical history. It's important to know if your dog has had contact with other dogs, for example, at dog training classes or boarding kennels.

In some cases, further investigations are necessary, for example:

• Listening to the heart and lungs

• Swab from throat or nose to detect pathogens

• Blood test

• X-ray when pneumonia is suspected

These examinations help to assess the severity of the disease and to initiate appropriate treatment.

Treatment of kennel cough in dogs

Treatment depends on the course of the illness and the pathogens involved, usually a combination of medication and adherence to certain behavioral guidelines. In mild cases, rest is the primary focus. Your dog should be kept physically calm, and dog sports and rough play should be avoided. Walks should be short and stress-free.

Depending on the situation, the following measures may be useful:

• Cough suppressants for a strong urge to cough

• Anti-inflammatory agents

• Antibiotics in case of bacterial involvement, especially Bordetella bronchiseptica

• Fever-reducing medications

• Supporting the respiratory system through moist air

It is important to always coordinate treatment with the veterinarian. If the infection is caused by viruses, antibiotics will not help, and symptom-relieving medications will be administered.

During the illness, your dog should not wear a collar, but rather a harness to avoid pressure on the neck. Cold air, smoke, and dust should also be avoided.

The role of vaccination

Vaccination against kennel cough is an important part of preventative care, but it does not offer 100% protection. This is due to the nature of the disease itself. Because many different viruses and bacteria can be involved, no single vaccine covers all pathogens.

Common vaccines target:

• Bordetella bronchiseptica

• CPIV or CPIV 2

• CAV 2

Vaccination against kennel cough can reduce the risk of infection, significantly lessen the severity of the illness, and shorten its duration. It is particularly recommended for dogs at high risk of infection, such as those who regularly attend dog training classes, stay in boarding kennels, or participate in dog shows. Accordingly, vaccination is also possible shortly before a potential exposure situation.

The duration of immunity varies depending on the vaccine. Generally, an annual booster vaccination against kennel cough is recommended, especially for at-risk dogs. Puppies can be vaccinated from the age of three weeks.

Kennel cough and puppies

Puppies are particularly susceptible to kennel cough because their immune system is not yet fully developed. An infection can be more severe in young dogs and lead to complications more quickly. Therefore, extra caution is advised.

Puppies should ideally have no unnecessary contact with many unfamiliar dogs until their vaccinations are fully established. Hygiene, a clean environment, and low-stress conditions are very important.

Difference between kennel cough, bronchitis and canine influenza

These three terms are often used synonymously, but there are differences. Kennel cough is the term for the infectious disease complex of the upper respiratory tract. Infectious tracheobronchitis describes the inflammation of the trachea and bronchi.

Bronchitis can also be non-infectious, for example, caused by irritants. "Canine flu" is more of a colloquial term and usually refers to a severe case of kennel cough with pronounced systemic symptoms.

Prevention and hygiene in everyday life

You can do several things to reduce the risk of kennel cough in your dog. While an infection can never be completely ruled out, good hygiene and a strong immune system are crucial.

Important measures include:

• Regular cleaning of dog toys and bowls

• Avoid close contact with coughing dogs

• Sufficient recovery periods after stressful situations

• Good indoor air quality

• Vaccinations after consultation with the veterinarian

You too can help prevent the spread of pathogens by washing your hands and changing your clothes after contact with unfamiliar dogs.

When should you be especially attentive?

In most cases, kennel cough in dogs is harmless. However, there are situations in which you should be particularly vigilant. These include:

• Persistent cough lasting several weeks

• High fever

• Shortness of breath

• Severe fatigue

• puppies or older dogs

• Suspected pneumonia

In such cases, a prompt examination by a veterinarian is important to avoid serious consequences.

Conclusion: How to correctly assess kennel cough in dogs

Kennel cough is a widespread infectious respiratory disease in dogs. Caused by viruses and bacteria, it spreads rapidly wherever many dogs congregate. Typical symptoms include coughing, a persistent tickly cough, and occasionally fever or lethargy.

With proper care, sufficient rest, and, if necessary, veterinary treatment, the disease usually heals well. Vaccination can reduce the risk and lessen the severity of the illness, but it does not replace vigilance and hygiene.

If you recognize the symptoms early and act responsibly, you will not only protect your own four-legged friend, but also other dogs from infection.