Kennel Cough in Dogs: Symptoms, How Long It Lasts, and When to Act

You've just picked up your dog from the kennel or a dog park visit and now they have a distinctive, honking cough that sounds almost like they're trying to clear something from their throat. If this sounds familiar, you're likely dealing with kennel cough — one of the most common respiratory infections in dogs. Most cases are manageable, but knowing what to expect and when to call the vet matters.

What Is Kennel Cough?

Kennel cough, officially called infectious tracheobronchitis, is a highly contagious respiratory infection affecting the trachea (windpipe) and bronchi (the airways into the lungs). It's caused most commonly by a combination of:

• Bordetella bronchiseptica (a bacterium — the primary culprit, also the target of the "Bordetella vaccine")
• Canine parainfluenza virus
• Canine adenovirus type 2
• Other respiratory viruses may also be involved

The condition spreads easily through the air, shared water bowls, and direct contact between dogs — hence why it's so common after kenneling, dog parks, grooming salons, doggy daycare, and dog shows (AAHA Preventive Healthcare Guidelines, 2011).

Symptoms of Kennel Cough

The hallmark symptom is a persistent, forceful cough that sounds like a honk or a goose honk. It can also sound like your dog is gagging or trying to bring something up. Other common signs:

• Hacking, honking cough — often worse with excitement or after drinking water
• Retching or gagging at the end of a cough
• Runny nose
• Eye discharge
• Sneezing
• Generally acting well in mild cases (eating, drinking, playful)

Symptoms typically appear 3–10 days after exposure.

Mild vs. Serious Kennel Cough

Mild (Most Cases)

In otherwise healthy adult dogs, kennel cough is often self-limiting — meaning it resolves on its own in 1–3 weeks, similar to a human common cold. Your dog may cough persistently but otherwise seem well — eating normally, maintaining energy, no fever.

Serious (Needs Veterinary Attention)

Seek veterinary care if your dog:

• Is lethargic, not eating, or seems to feel significantly unwell
• Has a fever (rectal temperature above 102.5°F)
• Shows rapid, labored, or difficulty breathing
• Develops a productive cough (coughing up mucus or blood)
• Is a puppy under 6 months, a senior dog, or immunocompromised
• Has not improved after 2 weeks, or is getting worse
• Has underlying conditions like heart disease or collapsing trachea

In puppies and immunocompromised dogs, kennel cough can progress to pneumonia — a serious and potentially life-threatening complication.

What to Do at Home

Rest and reduced exercise. Minimize vigorous activity, which can trigger coughing fits and delay recovery.

Use a harness instead of a collar. Pressure on the trachea from a collar aggravates coughing. Switch to a harness for all walks during recovery.

Humidify the air. A cool-mist humidifier in the room where your dog sleeps can soothe the irritated airway.

Honey. A small amount of plain honey (1 teaspoon for small dogs, 1 tablespoon for large dogs) can provide temporary soothing relief. This is a home comfort measure, not a treatment.

Isolate from other dogs. Kennel cough is highly contagious. Keep your dog away from other dogs until they've been symptom-free for at least 48 hours (or until cleared by your vet if antibiotics were prescribed).

Prevention

The Bordetella vaccine reduces the risk and severity of kennel cough, though it doesn't protect against all strains. Most kennels, groomers, and daycares require it. It's available as an injection, nasal spray, or oral preparation. Ask your vet what schedule is appropriate for your dog's lifestyle.

Still Not Sure if Your Dog Needs a Vet?

When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of what you're seeing — your dog's posture, any visible signs, and the affected area, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.

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