Could My Dog Have Kennel Cough? Symptoms, Treatment, and Prevention

Kennel cough is a common, contagious respiratory infection in dogs that causes a dry, honking cough. Learn when it’s an emergency, home care steps, treatment options, and prevention.

What is Kennel Cough?

Kennel cough (infectious tracheobronchitis) is an umbrella term for contagious upper respiratory infections in dogs. It’s most commonly caused by the bacterium Bordetella bronchiseptica, often together with viruses such as canine parainfluenza virus or canine adenovirus type 2. The hallmark symptom is a persistent, dry, honking cough. (Merck Veterinary Manual)

Most otherwise healthy dogs recover with supportive care, but puppies, seniors, and immunocompromised dogs can develop more serious disease such as pneumonia. Because it spreads easily where dogs mix (boarding kennels, dog parks, grooming facilities, shelters), early recognition and isolation are important.

Typical Signs and Symptoms

• A sudden onset of a loud, dry, hacking or "honking" cough (often worse with excitement or exercise)
• Cough that may produce a small amount of clear or white mucus
• Sneezing, nasal discharge (sometimes)
• Mild fever, decreased appetite, or lethargy in some dogs
• Symptoms usually appear 2–14 days after exposure

When to See a Vet Immediately

Seek veterinary attention right away if any of the following are present:

• Difficulty breathing, rapid breathing, or open-mouth breathing
• Blue or pale gums/tongue (signs of low oxygen)
• Collapse, fainting, or sudden weakness
• High fever (over about 104°F / 40°C) or worsening lethargy
• Coughing with blood or coughing that produces colored (green/yellow) discharge

Decision Support: Emergency, Urgent, or Wait-and-See?

• Emergency: Any difficulty breathing, collapse, blue gums, severe weakness, or severe fever. Go to an emergency clinic immediately.

• Urgent (see a veterinarian within 24 hours): Persistent cough lasting more than 48–72 hours, fever, lethargy, decreased appetite, puppies, seniors, or dogs with underlying disease (heart disease, diabetes, immunosuppression). Dogs showing worsening signs or not improving on initial home care should be evaluated.

• Wait-and-See (monitor at home for 24–48 hours): Bright, normal appetite, only the classic dry "honking" cough without fever or breathing difficulty. Isolate from other dogs and contact your vet if symptoms persist or worsen.

Diagnosis — What the Vet Will Do

A veterinarian will take a history (exposure to other dogs, vaccination status), perform a physical exam, and may recommend:

• Thoracic (chest) x-rays if pneumonia or heart disease is suspected
• Swabs from the throat or nose for bacterial culture or PCR testing to identify Bordetella, canine influenza, or other pathogens
• Bloodwork if systemic illness is suspected

Differential Diagnosis (Common Causes Ranked by Likelihood)

Your veterinarian will consider breed, age, vaccination, exposure history, and physical findings when ranking these possibilities.

Treatment Options (Veterinary-Directed)

Never attempt to prescribe or give antibiotics, cough suppressants, or other prescription drugs without veterinary guidance. Common treatments your veterinarian might recommend include:

• Supportive care: rest, reduced activity, humidified air (steam therapy) to ease coughing, and ensuring hydration and good nutrition.
• Antibiotics: used when Bordetella or secondary bacterial infection is suspected. Choice and duration depend on testing and clinical response.
• Antitussives (cough suppressants): may be prescribed for nonproductive hacking coughs to improve comfort, but are avoided if there’s concern for pneumonia because suppressing cough can trap infection.
• Bronchodilators or anti-inflammatories: sometimes used if airway inflammation or bronchospasm is suspected.
• Oxygen therapy, IV fluids, hospitalization: for dogs with severe respiratory distress or pneumonia.

Home Care Steps (For Mild Cases, Under Vet Advice)

• Isolate the affected dog from other dogs for at least 10–14 days or until advised by your vet to prevent spread.
• Keep the dog calm and restrict strenuous exercise until coughing improves.
• Use a cool-mist humidifier or sit with the dog in a steamy bathroom for short periods to help loosen secretions.
• Ensure easy access to fresh water and encourage eating; use palatable, warm foods if appetite is reduced.
• Do not give human cough medicines or antibiotics unless prescribed by your veterinarian — many human drugs are toxic to dogs or inappropriate for the condition.

Prevention

• Vaccination: Bordetella vaccines (intranasal/oral/injectable) and vaccines for canine parainfluenza and adenovirus help reduce the likelihood and severity of disease. They are commonly required for boarding, grooming, and daycare. Vaccines reduce severity but do not guarantee complete prevention. (Merck Veterinary Manual)
• Avoid exposure: Don’t board, socialize, or attend dog daycares while your dog is coughing; screen new dogs for symptoms before group activities.
• Hygiene: Clean and disinfect kennels, bowls, and shared spaces. Good ventilation reduces airborne spread.
• Test and isolate in multi-dog facilities during outbreaks; consult your veterinarian or shelter medicine specialist for outbreak control.

Red Flags - Seek Emergency Care

Seek immediate emergency veterinary care if you notice any of the following:

• Severe or worsening difficulty breathing, open-mouth breathing, or if the dog is unable to lay down to breathe comfortably
• Gums or tongue turning blue or very pale
• Sudden collapse or loss of consciousness
• Coughing up blood or a large amount of colored, foul-smelling discharge
• High fever, unresponsive to supportive care, or rapidly declining behavior

Common Questions Owners Ask

• How long is kennel cough contagious?

• Can people catch kennel cough?

• Will my dog need antibiotics?

Key Takeaways

• Kennel cough is a common, contagious upper respiratory infection most often caused by Bordetella bronchiseptica and respiratory viruses.
• The classic sign is a sudden, loud, dry "honking" cough. Many dogs remain otherwise bright, but puppies, seniors, and sick dogs can become very ill.
• Isolate affected dogs, use supportive care (rest, humidified air), and contact your vet for guidance. Never give prescription drugs without veterinary approval.
• Seek emergency care for breathing difficulty, collapse, blue gums, bloody cough, or high fever.
• Vaccination and good hygiene in group settings reduce risk and severity but don't guarantee complete protection.

Frequently Asked Questions