Dog Health
Kennel Cough in Dogs: Symptoms, Treatment & When to See a Vet
Published Last updated 3 min read
Quick answer
Kennel cough is a highly contagious upper respiratory infection that causes a harsh, honking cough, often triggered by excitement or pulling on the lead. Most dogs recover with rest in one to three weeks, but puppies, seniors, and brachycephalic breeds can develop pneumonia — contact your vet if breathing is laboured, appetite drops, or coughing persists beyond two weeks.
What is kennel cough?
Kennel cough — also called infectious tracheobronchitis — is not a single disease but a syndrome caused by several viruses and bacteria. The most common bacterial agent is Bordetella bronchiseptica, often working alongside viruses such as canine parainfluenza or canine adenovirus type 2.
The name reflects how easily it spreads in places where dogs gather: boarding facilities, daycare, dog parks, grooming salons, and training classes.
How does kennel cough spread?
Infected dogs shed pathogens when they cough, sneeze, or bark. Transmission happens through:
- Direct nose-to-nose contact
- Shared water bowls and toys
- Airborne droplets in enclosed spaces
- Contaminated hands or clothing
Incubation is typically three to ten days after exposure. A dog can be contagious before obvious symptoms appear.
Symptoms of kennel cough
The hallmark sign is a dry, honking cough that may sound like the dog is choking or gagging. Other signs include:
- Sneezing and nasal discharge
- Mild fever
- Reduced energy or appetite
- Retching after coughing (sometimes producing white foam)
Most dogs remain bright and eat normally. Worsening signs — lethargy, thick green nasal discharge, rapid breathing, or blue-tinged gums — suggest complications such as pneumonia and need urgent care.
Diagnosis and treatment
Your vet usually diagnoses kennel cough from history and examination. Chest X-rays or bloodwork may be recommended if pneumonia is suspected.
Treatment depends on severity:
- Mild cases: Rest, a harness instead of a collar, and avoiding irritants like smoke or cold air
- Moderate cases: Cough suppressants or anti-inflammatories as prescribed
- Bacterial involvement: Antibiotics such as doxycycline
- Severe cases: Hospitalisation with oxygen, IV fluids, and intensive monitoring
Never give human cough medicines without veterinary guidance — many contain ingredients toxic to dogs.
Prevention
The Bordetella vaccine reduces severity and spread but does not prevent all causes of kennel cough. Keep vaccinations current if your dog boards, attends daycare, or visits groomers. Avoid dog parks and group settings while your dog is coughing or for at least two weeks after symptoms resolve, as advised by your vet.
Sources & further reading
Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-24).
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Frequently Asked Questions
- How long does kennel cough last in dogs?
- Most mild cases improve within one to three weeks. Some dogs cough longer, especially if secondary infection develops or they are stressed or immunocompromised.
- Is kennel cough contagious to other dogs?
- Yes. It spreads through airborne droplets, shared bowls, and contact with contaminated surfaces. Isolate sick dogs until your vet says they are no longer contagious.
- Can humans catch kennel cough from dogs?
- True kennel cough is a canine illness. Some underlying pathogens are species-specific, though immunocompromised people should avoid close contact with coughing dogs and practise good hygiene.
- Does my dog need antibiotics for kennel cough?
- Not always. Many cases are viral and resolve with rest. Antibiotics may be prescribed if a bacterial component is suspected or if symptoms worsen.