Table of Contents
Last Reviewed: 27 July 2026
That sudden snorting, honking fit — your dog frozen mid-stride, neck stretched out, sucking air in through the nose in rapid bursts — is almost certainly a reverse sneeze. It’s alarming to watch, but in the vast majority of dogs it’s a brief, harmless reflex that clears irritation at the back of the nose, and it’s over in well under a minute. It is not kennel cough, and on its own it isn’t contagious. Below: how to tell a reverse sneeze apart from kennel cough at a glance, what actually sets it off, what to do while it’s happening, and the small number of signs that mean it’s worth a vet visit.
Reverse Sneezing vs Kennel Cough: How to Tell Them Apart
The fastest way to work out what you just witnessed is to think about which direction the air was moving. Reverse sneezing is your dog forcefully pulling air in through the nose. Kennel cough is air being forced out of the chest. That one distinction does most of the work — the table below fills in the rest, including the two other conditions owners most often confuse it with.
| Feature | Reverse sneezing | Kennel cough (CIRDC) | Collapsing trachea | Choking / foreign body |
|---|---|---|---|---|
| Airflow | Inward — rapid snorting through the nose | Outward — harsh, dry cough from the chest | Outward — high-pitched “goose-honk” cough | Variable, often ineffective; sometimes silent |
| Sounds like | Snorting, honking, “inhaling a sneeze” | Hacking, honking cough, often ending in a gag | Repetitive goose-honk, worse on excitement | Gagging, pawing at the mouth, panic |
| How long it lasts | Seconds to about a minute, then stops abruptly | Individual coughs recur over 1–3 weeks | Recurs over months to years, chronic | Sudden, doesn’t resolve on its own — emergency |
| Dog in between | Completely normal, no lingering signs | Usually bright, but the cough itself persists | May have exercise intolerance, noisy breathing | Ongoing distress until the obstruction clears |
| Contagious? | No — a reflex, not an infection | Yes — spreads readily between dogs | No — a structural airway problem | No — mechanical, not infectious |
| Typical trigger | Dust, pollen, excitement, eating fast, collar pressure | Recent contact with other dogs (daycare, boarding, parks) | Excitement, heat, collar pressure, obesity | Food, toys or sticks lodged in the mouth or throat |
This table is a simplification, not a diagnosis, but it captures what an owner can actually see and hear at home, drawn from how the MSD Veterinary Manual describes these conditions to owners.
Is this actually kennel cough?
If what you heard was a persistent, outward, honking cough that’s been going on for days — especially after your dog has been at daycare, boarding, a groomer or a busy dog park — that’s the pattern of kennel cough, not reverse sneezing. Our full canine cough vs kennel cough guide covers that condition in detail, our kennel cough hub is the place to start for everything else, and if you want to compare the actual sounds side by side, our kennel cough sound guide breaks them down.
Could it be collapsing trachea or choking instead?
Two other conditions get confused with reverse sneezing. Collapsing trachea produces a similar-sounding “goose honk,” but it’s an outward cough that recurs over months in small and toy breeds, not a brief inward snort. And a dog who is genuinely choking — pawing at their mouth, panicking, unable to draw breath — needs emergency care, not home management; if what you’re seeing looks more like retching or gagging than snorting, our guide to what it means when a dog sounds like they have something stuck walks through that distinction.
What a Reverse Sneezing Episode Looks and Sounds Like
A classic episode starts without warning. Your dog stops mid-stride, stiffens, and stretches their neck out, often lowering the head slightly rather than raising it. The front legs brace or splay a little, the eyes may widen, and the mouth usually stays closed, because the noise is being generated at the back of the nose, not in the throat. Then comes the sound: a series of rapid, rhythmic snorts as your dog forcefully sniffs air inward, often compared to a goose honking, a pig grunting, or a dog trying to inhale a sneeze. Some dogs seem briefly oblivious to their name — not because anything is wrong, but because the reflex has their full attention. It usually lasts a few seconds to under a minute, then stops as abruptly as it started, and your dog shakes themselves off and carries on exactly as before.
It’s worth saying plainly: reverse sneezing is usually far more alarming for the owner than for the dog. Cornell’s Riney Canine Health Center notes it’s a relatively common event that looks worse than it is, and that most dogs show no sign of distress once it’s over. Veterinary Partner‘s client information takes the same view: most affected dogs are completely normal between episodes and need no treatment at all beyond addressing an underlying cause, if one is ever found. There’s no evidence that an uncomplicated episode causes any lasting harm.
If what you’re watching looks and sounds more like a cough working its way up from the chest than a snort from the nose — especially if it’s been happening for more than a day or two — our full guide to coughing in dogs covers every pattern, from an occasional clearing of the throat to a persistent, worsening cough.
What’s Actually Happening in Your Dog’s Airway?
Reverse sneezing is what vets call the aspiration reflex, or paroxysmal respiration — a normal protective response to irritation of the nasopharynx, the space at the back of the nose just above the soft palate. A WSAVA conference paper on sneezing and snorting calls it “a normal response to any irritation of the dorsal nasopharyngeal mucosa”. The reflex arc itself is ordinary brainstem physiology: the irritation triggers a rapid spasm of the soft palate and pharynx paired with a forceful attempt to inhale, rather than the cough or ordinary sneeze that would clear irritation lower down or further forward. Because the soft palate partially narrows the airway during that spasm, the air moving past it becomes turbulent and noisy — which is where the snorting sound comes from.
Air normally travels from the nostrils through the nasal cavity into the nasopharynx, then past the soft palate into the throat proper. In reverse sneezing, that soft palate is thought to momentarily narrow or flutter against the irritation, which is why extending the neck — as most dogs instinctively do mid-episode — can help straighten and slightly widen the passage until the reflex passes.
A 2022 observational study of 30 dogs referred for reverse sneezing found that in most dogs the episodes were linked to identifiable irritation or abnormalities in the nasopharynx — most often inflamed, swollen tissue, and in a minority an elongated soft palate — reinforcing that reverse sneezing is a visible sign of something happening in the airway, not a disease in its own right. Because the dog stays conscious and coordinated throughout a typical episode, oxygenation generally isn’t seriously affected — the reflex looks dramatic but is, in the overwhelming majority of cases, a short-lived and self-clearing event.
What Triggers Reverse Sneezing?
Almost anything that irritates the nose or the back of the throat can set off an episode. The most commonly reported triggers are excitement or sudden arousal, eating or drinking too quickly, and pressure on the neck from pulling against a collar — which is one reason many vets suggest switching a frequent reverse-sneezer to a harness. Environmental irritants matter too: dust, pollen, mould, cigarette smoke, perfumes, air fresheners and cleaning sprays can all trigger a bout, and so can a sudden change in temperature, such as stepping out into cold night air. Post-nasal drip from ordinary nasal irritation or allergies primes the area further, and nasal mites — a genuinely common but under-recognised cause — can trigger repeated episodes on their own.
Where your dog spends time matters as much as what’s happening in the moment. Dogs that sleep on dusty floors, old carpet, or bedding near a radiator or vent are exposed to higher concentrations of household dust and allergens, especially overnight — which is part of why some dogs seem to reverse sneeze most first thing in the morning. Improving ventilation, vacuuming and washing bedding regularly, and switching to unscented cleaning products are simple, low-effort changes that genuinely reduce how often a sensitive dog meets a trigger.
If your dog also has an ongoing stuffy or congested-sounding nose between episodes, rather than isolated snorting fits, that’s a different pattern worth reading about separately — see our guide to dog congestion.
Which Dogs Get Reverse Sneezing Most?
Any dog can reverse sneeze, but two groups are especially prone to it. Brachycephalic, flat-faced breeds — Pugs, Bulldogs, French Bulldogs, Shih Tzus and similar — often have an elongated soft palate and narrowed nostrils as part of brachycephalic obstructive airway syndrome (BOAS), which makes the nasopharynx more prone to the turbulence that triggers reverse sneezing. Small and toy breeds are also disproportionately affected, and in this group occasional reverse sneezing is common enough that The Kennel Club describes a single episode as usually nothing to worry about, provided episodes stay infrequent and brief and the dog is otherwise well. Dogs with longer noses aren’t exempt either — their narrower nasal passages can give irritants and secretions more surface area to collect against, which may help explain why reverse sneezing turns up across such a wide range of shapes and sizes rather than being confined to one body type. Being overweight can make things worse in any breed, since it adds to existing airway narrowing.
What to Do During a Reverse Sneezing Episode
Your first job is to stay calm and watch, not intervene. Check that your dog is conscious, standing, and that their gums stay a healthy pink — those are the signs that tell you this is a typical episode rather than a genuine emergency. Most episodes resolve completely on their own within seconds to a minute or two, with no action needed at all, as Cornell reassures owners.
That said, Cornell suggests gently massaging the throat, holding the nostrils closed for a few seconds, or even blowing into the dog’s face to encourage swallowing — all thought to work by prompting a swallow that resets the soft palate. It’s worth being honest about the evidence: none of these have been tested in controlled trials, and because episodes end on their own so quickly anyway, it’s hard to know how much difference they make. What can be said is that they come from a veterinary teaching hospital rather than folklore, and that they are harmless when done gently. Avoid pinching the nose hard or holding it closed for any length of time, and never put your fingers into your dog’s mouth or throat.
If a single short episode resolves and your dog goes straight back to normal, there’s no need for anything more than a mental note — mention it at their next routine check-up. Save an emergency call for a dog who collapses, seems truly unable to breathe, or whose gums turn blue or pale — those aren’t reverse sneezing.
When Reverse Sneezing Isn’t Simple: Red Flags
An occasional short episode in an otherwise healthy dog is rarely worth worrying about. What changes the picture is a shift in pattern: episodes becoming more frequent, longer, or more severe; a first episode appearing suddenly in an older dog; or reverse sneezing turning up alongside other signs. Specifically, get in touch with your vet if you notice nasal discharge — especially if it’s thick, coloured, or coming from just one nostril — nosebleeds, facial swelling or pain, pawing at the face, appetite or weight loss, lethargy, or laboured breathing between episodes. Our guide to what different kinds of nasal discharge mean is worth reading if that’s part of the picture.
Genuine breathing difficulty — fast or laboured breathing at rest, open-mouth breathing, blue or pale gums, or collapse — is never something to attribute to reverse sneezing, and needs urgent attention regardless of what triggered it. See our guide to fast or laboured breathing in dogs if you’re not sure whether what you’re seeing has crossed that line, and our full symptoms hub is a good place to check anything else you’re noticing alongside it.
When reverse sneezing does need investigating, a handful of causes come up repeatedly. Nasal mites are small parasites that live in the nasal passages and are more common than most owners realise; they’re treatable with the right anti-parasitic medication once identified. Foreign bodies — typically grass seeds or blades of grass inhaled during vigorous sniffing outdoors — can lodge in the nasal passages and trigger repeated episodes until removed, and are worth suspecting if the discharge is one-sided rather than from both nostrils. Nasal polyps or tumours are less common but more likely in older dogs with new-onset signs, and dental disease can play a role too, since the roots of the upper teeth sit close to the nasal passages and an infection there can track upward. Chronic rhinitis or sinusitis — whether allergic, infectious, or with no clear identifiable cause — tends to produce a mix of ordinary sneezing, reverse sneezing and discharge together, rather than reverse sneezing alone. In brachycephalic dogs with more significant BOAS, frequent reverse sneezing can be part of a broader pattern that’s worth a dedicated veterinary assessment, sometimes including surgical options to widen the airway.
What Your Vet Will Do — and Why Filming an Episode Helps
Because episodes are brief and unpredictable, your vet will very rarely see one happen in the consulting room. A short video clip on your phone is one of the most genuinely useful things you can bring to an appointment — it lets your vet confirm the pattern, direction of airflow and duration that mark out a typical reverse sneeze, rather than relying on your description alone, and helps rule out coughing, choking or a seizure.
For a dog with frequent or atypical episodes, your vet will usually start with a thorough history and a look at the nose, mouth and throat, checking airflow through each nostril and listening to the chest. If that points toward an underlying cause, next steps might include blood tests, a trial of anti-parasitic treatment for nasal mites, allergy management, or — for persistent, severe or atypical cases — imaging and rhinoscopy to look directly inside the nasal passages, techniques set out in the MSD Veterinary Manual‘s wider respiratory disease guidance and in the 30-case reverse sneezing study. Most dogs referred for investigation turn out to have a manageable, treatable cause, and the outlook for straightforward reverse sneezing is excellent.
Frequently Asked Questions
Is reverse sneezing dangerous?
Not usually. In an otherwise healthy dog, reverse sneezing is a benign reflex that clears irritation from the back of the nose — it looks alarming but rarely reflects anything serious. Frequent, prolonged or worsening episodes, or ones that come with other symptoms, are the exception, and that pattern is worth a vet visit to rule out a treatable underlying cause.
How long does an episode last?
Typically just seconds up to around a minute, ending abruptly with your dog straight back to normal. Episodes that consistently run much longer, or that leave your dog distressed afterwards, aren’t typical and are worth mentioning to your vet.
Why does my dog reverse sneeze so often?
Usually because something is repeatedly irritating the back of their nose — dust, pollen, strong smells, temperature changes, or excitement are the everyday culprits. If it’s happening in clusters or getting more frequent, allergies, chronic nasal inflammation, nasal mites or a structural issue such as an elongated soft palate become more likely, and are worth investigating with your vet.
Could this be kennel cough?
Almost certainly not — reverse sneezing and kennel cough are different things. Reverse sneezing is a brief, inward, non-contagious reflex; kennel cough is a contagious infection that produces a persistent, outward cough lasting days to weeks, usually after contact with other dogs. It’s possible, if unusual, for a dog to have both at once. See our canine cough guide for the full picture, our page on canine infectious tracheobronchitis for the clinical detail, or our rundown of the signs of kennel cough if you want to check the full symptom list.
How do I stop an episode?
You mostly can’t — and mostly don’t need to, since it resolves on its own within a minute. Cornell suggests gently massaging the throat, holding the nostrils closed for a few seconds, or blowing into your dog’s face to encourage a swallow. None of it has been tested in a controlled trial, but it is harmless done gently, and Cornell puts the prognosis for reverse sneezing at excellent for most dogs. Stay calm, avoid forceful restraint, and never put your fingers in your dog’s mouth or throat.
Should I see a vet?
For a single brief episode in an otherwise healthy dog, no — just mention it at your next routine visit. See a vet sooner if episodes are frequent, prolonged, or paired with nasal discharge, facial swelling, appetite loss, lethargy or breathing difficulty, and treat laboured breathing, blue or pale gums, or collapse as an emergency regardless of the cause.
Do allergies cause it?
They can contribute. Allergens such as pollen, dust mites and mould can inflame the nasal passages and lead to post-nasal drip, which primes the area for reverse sneezing — though not every dog with allergies reverse sneezes, and not every dog who reverse sneezes has allergies.
Is it contagious?
No. Reverse sneezing is a reflex to local irritation, not an infection, so it doesn’t spread between dogs the way kennel cough does. If only one dog in a multi-dog household reverse sneezes now and then, that’s normal and not a sign the others are at risk.
Reverse sneezing looks and sounds far worse than it usually is, and most dogs are back to normal within seconds of it starting. But if your dog’s gums turn blue or pale, their breathing becomes genuinely laboured, they collapse, or episodes are becoming more frequent or severe, treat that as a reason to see a vet rather than something to wait out.
