Kennel Cough in Australia: Causes, Treatment, and Prevention
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Kennel cough — formally known as canine infectious tracheobronchitis — is a highly contagious respiratory illness in dogs caused primarily by Bordetella bronchiseptica bacteria and canine parainfluenza virus. It produces a distinctive persistent, dry, honking cough that sounds like something is stuck in the dog's throat. Kennel cough spreads rapidly wherever dogs are in close contact — at kennels, dog parks, groomers, shelters, and vet clinics. Most healthy adult dogs recover within one to two weeks, but puppies, senior dogs, and immunocompromised dogs can develop more serious complications including pneumonia. |
If you've ever picked up your dog from a boarding kennel or taken them to the dog park and they've come home with a strange, honking cough a few days later — you've probably encountered kennel cough. It's one of the most common canine illnesses in Australia, and one that every dog owner benefits from understanding.
Here's everything you need to know: what causes it, how to recognise it, what to do when your dog has it, and how to protect your dog from getting it in the first place.
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What Causes Kennel Cough?
Kennel cough is rarely caused by a single pathogen — it's almost always a combination of infections working together to damage the respiratory tract. Think of it like a human head cold, which is similarly caused by a cocktail of viruses rather than one specific bug.
The most common culprits in Australian kennel cough cases are:
• Bordetella bronchiseptica — the primary bacterial agent; attaches directly to the cilia (hair-like cells lining the respiratory tract) and disrupts the airway's natural defence mechanism
• Canine parainfluenza virus — a viral agent that commonly acts in combination with Bordetella; vaccination is available for both
• Canine adenovirus type 2 — another viral contributor, covered by the standard C5 vaccination
• Canine influenza virus — less common but can cause more severe disease when involved
• Mycoplasma species — bacterial agents sometimes found in more complex cases
The infection spreads through airborne droplets when an infected dog coughs or sneezes, through direct contact with an infected dog, and through shared surfaces — toys, water bowls, bedding, fences in kennels. Environmental factors like stress, poor ventilation, and high dog density all increase the speed of spread.
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💡 Incubation period: Symptoms typically appear 3–10 days after exposure. This means a dog can be incubating kennel cough while appearing completely healthy — which is why it spreads so effectively in boarding environments where dogs arrive from different households. |
Recognising Kennel Cough: Signs and Symptoms
The hallmark of kennel cough is a cough that is hard to mistake once you've heard it. It's persistent, dry, and forceful — often described as a goose honk, or the sound of a dog trying to clear something from its throat. It frequently ends with a gagging or retching motion that can look like the dog is about to vomit.
The full picture of kennel cough symptoms:
• Persistent dry, hacking cough — the defining feature; may be triggered by exercise, excitement, or pressure on the trachea
• Gagging or retching — often occurs at the end of a coughing episode; the dog may produce a small amount of foamy mucus
• Runny nose — a mild clear discharge is common
• Sneezing
• Mild lethargy — a mild energy dip in an otherwise functional dog
• Slightly reduced appetite
• Mild fever — may be present but isn't always detectable without a thermometer
The important characteristic of uncomplicated kennel cough is that despite the dramatic-sounding cough, the dog generally remains alert, continues eating reasonably, and doesn't appear severely unwell. A dog that is very lethargic, refusing food, has a high fever, or is struggling to breathe needs veterinary attention urgently — these signs may indicate progression to pneumonia.
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⚠️ See your vet immediately if: Your dog develops: laboured or rapid breathing; a high fever; complete refusal to eat; green or yellow nasal discharge; extreme lethargy. These signs may indicate pneumonia — a serious complication that requires prompt treatment. |
How Is Kennel Cough Diagnosed?
Kennel cough is typically diagnosed by your vet based on clinical history and symptoms — the combination of recent exposure risk (boarding, dog park, grooming) and the characteristic cough pattern is usually enough for a working diagnosis.
In straightforward cases, additional testing is generally not needed. If the presentation is atypical, symptoms are more severe, or the dog isn't responding to initial treatment, your vet may recommend:
• Chest X-rays — to check whether pneumonia has developed in the lungs
• Nasal swabs — sent for PCR or culture testing to identify the specific pathogen involved
• Blood tests — to assess the overall health of the dog and check for signs of more serious infection
It's worth noting that several other conditions can cause coughing in dogs — heart disease, collapsing trachea, bronchitis, heartworm, and canine distemper can all produce coughs. Your vet's examination rules these out or in.
Treating Kennel Cough in Australia
The treatment approach depends on how unwell your dog is. Most cases of kennel cough in otherwise healthy adult dogs are mild and self-limiting — the dog recovers within 1–2 weeks with supportive care and rest, similar to how humans recover from a cold.
For mild cases: supportive care at home
• Rest — limit exercise and excitement, which can trigger and worsen coughing bouts
• Hydration — ensure fresh water is always available
• Humidification — running a humidifier in the room where your dog rests, or briefly bringing them into a steamy bathroom, can help soothe irritated airways
• Switch from collar to harness — pressure on the throat from a neck collar can trigger or worsen coughing; use a body harness for walks until the cough resolves
• Honey — a small amount of raw honey can soothe an irritated throat; check with your vet for appropriate dosing and don't use for puppies or diabetic dogs
• Isolation from other dogs — kennel cough is highly contagious; keep your dog away from other dogs for the duration of illness and for at least two weeks after symptoms resolve
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🩺 Vet advice: Do not give your dog any human cough medicines, antihistamines, or other human medications without explicit guidance from your vet. Many human medications are toxic to dogs, and some common human cold remedies can be seriously harmful. |
When medication is needed
Your vet may prescribe:
• Antibiotics — prescribed when there's a bacterial component (Bordetella) or secondary bacterial infection; common choices include doxycycline or amoxicillin-clavulanate. Note: antibiotics don't treat viral components of kennel cough
• Cough suppressants — may be prescribed to reduce the frequency and intensity of coughing, particularly at night, to allow the dog to rest and recover
• Anti-inflammatories — occasionally prescribed to reduce airway inflammation
If pneumonia has developed, more aggressive treatment including hospitalisation, IV antibiotics, and supportive care may be required — this is why catching and treating kennel cough promptly is important, particularly in vulnerable dogs.
Preventing Kennel Cough: Vaccination and Management
The kennel cough vaccine (Bordetella vaccine)
Vaccination is the most effective preventative measure against kennel cough. In Australia, the standard recommendation is the C5 vaccination (or C7 for some high-risk dogs), which covers:
• Canine distemper virus
• Canine adenovirus type 2 (also protects against type 1, which causes hepatitis)
• Canine parvovirus
• Canine parainfluenza virus — one of the kennel cough pathogens
• Bordetella bronchiseptica — the primary kennel cough bacterial agent
The vaccine doesn't guarantee complete protection — because kennel cough can be caused by multiple pathogens, a vaccinated dog can still contract a strain not covered by the vaccine. But vaccination significantly reduces the risk of infection and almost always reduces the severity of illness if a vaccinated dog does contract kennel cough.
The kennel cough vaccine is typically required by boarding kennels, doggy day care, and groomers before they'll accept your dog. Check your dog's vaccination record and talk to your vet about timing if you're planning boarding.
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💡 Vaccine timing: Some kennel cough vaccines — particularly the intranasal form — require a period to establish immunity after administration. If you're planning to board your dog, talk to your vet at least 2 weeks before boarding to ensure vaccination is current and protection is established. |
Management and hygiene practices
• Avoid high-risk environments — kennels, dog parks, grooming facilities, and off-leash areas — if there's a known kennel cough outbreak in your local area
• Clean and disinfect shared dog equipment — bowls, bedding, toys — if your dog has been in contact with other dogs
• Isolate sick dogs immediately — kennel cough spreads quickly in multi-dog households; an infected dog should be separated and their bedding and equipment treated
• Support your dog's immune system with regular vet checks, a quality diet, and consistent parasite control — a healthy immune system provides better resistance
Kennel Cough Quick Reference
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Factor |
Details |
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What it is |
Canine infectious tracheobronchitis — highly contagious respiratory illness |
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Main causes |
Bordetella bronchiseptica + canine parainfluenza virus (often in combination) |
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How it spreads |
Airborne droplets, direct contact, shared surfaces |
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Incubation |
3–10 days after exposure |
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Main symptom |
Persistent dry honking cough; gagging/retching at end of cough |
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Duration |
1–2 weeks in mild cases; longer in complicated cases |
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Treatment (mild) |
Rest, hydration, isolation, harness instead of collar, humidification |
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Treatment (moderate) |
Vet-prescribed antibiotics and/or cough suppressants |
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When to see vet urgently |
Laboured breathing, high fever, refusal to eat, extreme lethargy |
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Prevention |
C5 vaccination; avoid high-risk environments during outbreaks |
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Frequently Asked Questions
Is kennel cough contagious to humans?
In healthy adults, the Bordetella bronchiseptica bacteria that causes kennel cough is generally not a significant risk. However, people with significantly compromised immune systems, infants, and the elderly may have slightly elevated risk. If someone in your household is immunocompromised and your dog has kennel cough, speak to both your vet and the person's doctor for guidance.
How long is a dog with kennel cough contagious to other dogs?
A dog with kennel cough can be contagious to other dogs for up to 2–3 months after infection — potentially even after symptoms have fully resolved. The standard practical guidance is to keep your dog isolated from other dogs for at least 2 weeks after symptoms have completely cleared.
Can cats get kennel cough from dogs?
Cats can be infected by Bordetella bronchiseptica, but typically through cat-to-cat transmission rather than from dogs. Kennel cough is overwhelmingly a dog disease in the way the term is used — if your cat develops a respiratory illness, see your vet for a proper feline diagnosis.
My dog was vaccinated — why did they still get kennel cough?
The C5 vaccine provides protection against the main kennel cough pathogens — Bordetella bronchiseptica and canine parainfluenza — but kennel cough can also be caused by other viruses and bacteria not covered by the vaccine. Think of it like the human flu vaccine: highly protective, but not a guarantee against every strain. Vaccinated dogs who do contract kennel cough typically have a milder, shorter illness than unvaccinated dogs.
Do I need a prescription to buy kennel cough treatment?
Kennel cough vaccines are administered by a vet and require a vet visit. If your vet prescribes antibiotics or other medications to treat kennel cough, Scriptly can fulfil prescription pet medications with a valid script. Learn how ordering at Scriptly works — including how to upload your prescription.
