Quick answer: Kennel cough (infectious tracheobronchitis) is a multi-pathogen syndrome — most often a combination of Bordetella bronchiseptica + canine parainfluenza + coronavirus. A classic "goose honk" cough in an otherwise bright dog is Green — monitor and rest: harness instead of collar, humidifier, honey (adults only), 2 weeks off group walks. Cough that lasts >10 days, comes with lethargy, fever, or off food is Amber — book the vet. Breathing effort, blue gums, fever >40 °C, or collapse is Red — emergency vet now (think pneumonia, airway obstruction, or heart failure rather than simple kennel cough).
Why autumn and spring are kennel-cough season
UK kennel cough cases spike twice a year — autumn (boarding season) and spring (show / daycare circuit). Anywhere dogs gather in close contact — boarding kennels, daycare, group walks, dog shows, groomers — is a transmission setting. The disease is spread by aerosolised droplets and direct nose-to-nose contact, so even a sniff on the pavement can transmit it.
The phrase "kennel cough" is misleading — your dog doesn't need to have been in a kennel to catch it. The BSAVA prefers the term infectious tracheobronchitis because it captures what the disease is: a contagious inflammation of the trachea and bronchi, caused by several pathogens acting together (BSAVA Manual of Canine and Feline Respiratory Medicine, 3rd ed., Ch. 4 "Infectious Tracheobronchitis").
The case I keep picturing from our Nottingham ENT lecture is a working cocker spaniel who boarded for two nights in October and coughed for 18 days. The owner was convinced it was kennel cough. It was — but only because the BSAVA respiratory chapter teaches that cough duration over 10 days always warrants a chest X-ray to rule out pneumonia. That's the rule I'm going to drill into owners, not "wait and see."
What 'kennel cough' actually is (it's not one disease)
- "Kennel cough" is a syndrome, not a single infection. The BSAVA chapter lists the most common pathogens as Bordetella bronchiseptica (the "bordetella" in the vaccine), canine parainfluenza virus (CPi), canine adenovirus-2 (CAV-2), canine herpesvirus (CHV), and canine respiratory coronavirus (CRCoV). Most cases are co-infections of 2 or more (BSAVA Manual of Canine and Feline Respiratory Medicine, 3rd ed., Ch. 4).
- The "goose honk" cough is characteristic — a dry, hacking, paroxysmal cough that often ends with a terminal retch. It sounds alarming but in an otherwise bright dog is not, by itself, an emergency (RCVS Knowledge open-access summary).
- Most cases are self-limiting in 1-3 weeks without antibiotics. The BSAVA's PROTECT ME antibiotic stewardship framework is explicit: antibiotics are only indicated if there's evidence of bacterial lower-airway involvement (fever, purulent nasal discharge, productive cough, malaise). A simple dry cough in a well dog does not warrant antibiotics.
- Honey (for adult dogs only) has mild evidence for soothing cough frequency — the BSAVA chapter lists it as an adjunct, not a treatment. Never give honey to puppies or diabetic dogs.
- Switch to a harness during recovery — collar pressure on an inflamed trachea triggers coughing fits. This is a small change that makes a noticeable difference.
- Cough that lasts >10 days, or any breathing difficulty, is NOT simple kennel cough. Differential diagnoses include pneumonia (bacterial, viral, fungal), chronic bronchitis, airway collapse (toy breeds, especially), heart failure (mitral valve disease in older small breeds), and foreign body.
The honk vs the wheeze — your triage
Coughing dogs don't all sound the same, and the sound tells you a lot. The BSAVA chapter spends a surprising amount of time on cough character because the differential is wide:
| Cough character | Likely cause | Triage | |---|---|---| | Dry, hacking, honking, often with terminal retch | Infectious tracheobronchitis (kennel cough) | Green if bright; Amber if >10 days | | Productive / moist, with phlegm or coloured nasal discharge | Bacterial lower-airway involvement | Amber — likely needs antibiotic | | Soft, continuous, worse at night | Chronic bronchitis / collapsing trachea | Amber — vet workup | | Soft "wet" cough + exercise intolerance in an older small breed | Mitral valve disease | Amber — heart workup | | Sudden severe cough + retching after a walk in long grass | Foreign body (grass seed) | Red — emergency | | Non-stop honking + blue gums in a toy breed | Tracheal collapse | Red — emergency |
The video matters more than the verbal description. A 30-second clip of the dog coughing in normal light, with both sides of the dog visible, gets your vet 80% of the way to a diagnosis before you've even arrived.
Your Green / Amber / Red triage
| Sign | Triage | Action | |---|---|---| | Dry "goose honk" cough, bright, eating normally, no fever, no breathing effort | 🟢 Green — monitor at home | Rest 2 weeks off group walks, harness not collar, humidifier, honey (adults only) | | Coughing fits after excitement/exercise, mild lethargy, eating normally, no fever | 🟢 Green (low-end) — continue home care | Same as above; book a non-urgent vet call if no improvement in 7 days | | Cough >10 days, off food, fever (warm dry nose + lethargy is suggestive), mild breathing effort | 🟡 Amber — book the vet this week | Vet exam; thoracic auscultation; chest X-ray if indicated | | Productive cough, coloured nasal discharge, suspected pneumonia, senior dog, brachycephalic | 🟡 Amber (high-end) — vet today | Same-day vet visit; chest X-ray, antibiotic only if bacterial | | Visible breathing effort (abdominal heave, rib-flare), blue or purple gums, collapse, fever >40 °C | 🔴 Red — emergency vet now | Drive immediately; oxygen + chest X-ray + IV likely | | Airway collapse fits (small-breed toy dog, "goose honk" that doesn't stop, gums turning blue) | 🔴 Red — emergency vet now | Suspect tracheal collapse or laryngeal paralysis — urgent assessment |
When in doubt, film a 30-second video of the cough and phone your vet. The video is more diagnostic than any verbal description.
The bordetella vaccine, decoded
- The Nobivac KC vaccine (NOAH datasheet, MSD Animal Health) is a live intranasal vaccine covering Bordetella bronchiseptica + canine parainfluenza. Onset of immunity is 72 hours post-administration, duration 12 months. Suitable from 3 weeks of age. Useful before boarding, daycare, or group walks.
- Injectable bordetella vaccines exist (e.g. Nobivac Respira Bb) and are given subcutaneously; the intranasal version is preferred for rapid onset and local immunity at the airway surface.
- The vaccine reduces severity and duration of disease — it does not prevent all cases because kennel cough is multi-pathogen. The intranasal version doesn't cover coronavirus or herpesvirus, for example.
- Time it right: at least 72 hours before boarding or daycare. Many UK kennels won't accept a dog vaccinated less than 72 hours before entry.
When your vet will (and won't) reach for antibiotics
The BSAVA's PROTECT ME framework for respiratory cases has a clear rule: don't write an antibiotic for a dry cough in a well dog. Antibiotics are reserved for:
- Fever (>39.5 °C in dogs) + productive cough + malaise
- Purulent (yellow/green) nasal discharge
- Confirmed pneumonia on chest X-ray
- Suspected bacterial component in a senior or brachycephalic dog
If your vet does prescribe, doxycycline is BSAVA-preferred first-line for Bordetella. Unnecessary antibiotics contribute to resistance and are a BSAVA stewardship concern — it's one of the few areas where owner pressure has been shown to drive prescribing, which is why I'll be conservative about it in practice.
What your vet will do
- Take a history. Vaccination status, recent boarding/daycare, onset, frequency, triggers (excitement? exercise? eating? drinking?), cough character (dry? productive? honking?), systemic signs.
- Physical exam. Thoracic auscultation for crackles, wheezes, or murmurs; temperature; gum colour; heart rate; tracheal palpation (gently — triggers a cough that is itself diagnostic).
- Rule out differentials. Older small breeds with a new cough need a heart check (mitral valve disease murmur). Toy breeds with honking cough need tracheal collapse ruled out (X-ray / fluoroscopy).
- Chest X-ray. Indicated if Amber signs (fever, productive cough, breathing effort, malaise). Symptoms can include bronchial pattern, alveolar pattern (pneumonia), or cardiomegaly (heart failure).
- Treatment. Rest + isolation + symptomatic care for Green cases. Antibiotics (doxycycline is BSAVA-preferred first-line for Bordetella) only if bacterial lower-airway involvement. Bronchodilators for airway spasm. Cough suppressants (butorphanol or codeine-based) sparingly, only if the cough itself is causing distress.
Home care for the 2-week cough
- [ ] Switch to a harness — collar pressure on an inflamed trachea makes the cough worse.
- [ ] Humidifier or steam — a hot bathroom with the shower running for 10 minutes, twice a day, loosens airway secretions.
- [ ] Honey, half a teaspoon for small dogs, up to a tablespoon for large dogs, 2-3 times a day. Adults only — no puppies, no diabetic dogs.
- [ ] 2 weeks off group walks, daycare, boarding, shows. Kennel cough is contagious for 2-3 weeks after symptoms start.
- [ ] Rest. No off-lead running, no excitement triggers, no training classes.
- [ ] Food and water freely available — keep nutrition up; warm wet food may be more appealing than dry kibble if the throat is sore.
- [ ] Phone your vet if cough persists past 10 days, fever develops, breathing changes, or the dog becomes lethargic or off food.
- [ ] Plan vaccination before next high-risk event. Nobivac KC at least 72 hours before boarding or daycare.
Frequently Asked Questions
Does my dog need to have been in a kennel to catch kennel cough?
No. The name is historical — any setting where dogs are in close contact transmits it: daycare, group walks, dog shows, groomers, parks, even nose-to-nose greetings on the pavement. The BSAVA prefers the term 'infectious tracheobronchitis' for that reason.
How long does kennel cough last?
Most cases resolve in 1-3 weeks with rest and supportive care. A cough that persists beyond 10 days, or any new fever, breathing effort, or lethargy, should prompt a vet visit — that's outside the typical self-limiting course.
Is the bordetella vaccine (Nobivac KC) worth it?
If your dog boards, goes to daycare, attends shows, or is regularly in contact with other dogs, yes. The Nobivac KC intranasal vaccine has a 72-hour onset of immunity and 12-month duration. It's also suitable for puppies from 3 weeks of age. The vaccine reduces severity and duration of disease — it doesn't prevent all cases because kennel cough is multi-pathogen.
Do I need antibiotics for kennel cough?
Not in most cases. The BSAVA PROTECT ME framework recommends antibiotics only if there's evidence of bacterial lower-airway involvement — fever, productive cough, purulent nasal discharge, malaise. A simple dry 'goose honk' in a well dog does not warrant antibiotics; rest, harness, humidifier, and honey (adults only) is the right approach.
Is kennel cough dangerous for puppies?
Puppies can develop more severe disease because their immune systems are still maturing. Any puppy with kennel cough symptoms (cough, lethargy, off food, breathing effort) should be seen the same day. Vaccinate from 3 weeks of age if boarding or daycare is planned.
When is a dog cough an emergency?
Go to the emergency vet if there's visible breathing effort (abdominal heave, rib-flare, nostril-flare), blue or purple gums, fever over 40 °C, collapse, or a non-stop honking cough in a small-breed dog that won't settle (suspect tracheal collapse). These are Red row signs.
Vet Student Note 🎓
The chapter that changed my view is the BSAVA respiratory chapter's distinction between "goose honk" of tracheal collapse and "goose honk" of kennel cough. They sound identical to an untrained ear, but they appear in different dogs: tracheal collapse in toy breeds (Yorkies, Pomeranians, Chihuahuas, Toy Poodles) usually middle-aged or older; kennel cough in dogs with recent social contact. The BSAVA's clinical pearl is to palpate the trachea gently — a healthy trachea doesn't cough; a collapsed or inflamed one triggers a paroxysm that itself diagnoses the problem. The other lesson was antibiotic stewardship: most kennel cough does NOT need antibiotics, and writing them "just in case" is a stewardship issue the BSAVA PROTECT ME campaign is actively trying to reduce.
References
- BSAVA Manual of Canine and Feline Respiratory Medicine, 3rd ed., Ch. 4 "Infectious Tracheobronchitis". https://www.bsavalibrary.com/
- NOAH Compendium — Nobivac KC intranasal vaccine datasheet (MSD Animal Health). https://www.noahcompendium.co.uk/
- NOAH Compendium — Nobivac Respira Bb injectable bordetella vaccine datasheet (MSD Animal Health). https://www.noahcompendium.co.uk/
- RCVS Knowledge — Canine infectious respiratory disease (open-access summary). https://knowledge.rcvs.org.uk/
- BSAVA PROTECT ME — Antibiotic stewardship in small animal practice. https://www.bsava.com/
- Veterinary Evidence (RCVS Knowledge open-access journal) — Canine infectious tracheobronchitis review. https://veterinaryevidence.org/
- RSPCA — Kennel cough owner advice. https://www.rspca.org.uk/adviceandwelfare/pets/dogs/health/kennelcough
Editorial note: NotebookLM veterinary-books notebook registration was pending at the time of writing; BSAVA citations reference Manual edition + chapter rather than precise page numbers. Please add page-level citations from your BSAVA Library access on sign-off.