That sudden, loud snorting your dog makes is almost certainly a reverse sneeze, a reflexive spasm of the throat and soft palate that pulls air rapidly inward through the nose instead of pushing it out. It sounds alarming, like your dog is choking or struggling to breathe, but in most cases the episode ends on its own within 30 seconds and causes no harm. That said, frequent or prolonged snorting can sometimes point to an underlying issue worth investigating.
What a Reverse Sneeze Actually Is
A normal sneeze forces air out through the nose to expel an irritant. A reverse sneeze does the opposite: the airway opening to the windpipe closes briefly while the dog inhales forcefully and repeatedly through the nose. The tissues of the throat and soft palate (the fleshy flap at the back of the mouth) go through rapid cycles of contraction and relaxation, and it’s this spasming that creates the loud, pig-like snorting sound.
During an episode, your dog will typically stand still with their neck stretched forward, head tilted slightly back, elbows splayed outward, nostrils flared, and mouth closed. It looks dramatic, but the dog is essentially trying to clear something from the back of its nasal passage. Think of it as a sneeze in reverse: instead of blowing an irritant out, the body is trying to suck it down and swallow it.
Common Triggers
Reverse sneezing is a response to irritation in the nasopharynx, the area where the back of the nasal passages meets the throat. Anything that tickles or inflames that area can set it off:
- Dust, pollen, and mold are among the most frequent culprits, especially during seasonal changes.
- Strong scents like perfumes, cleaning products, or candles.
- Excitement or pulling on a leash, which puts pressure on the throat.
- Eating or drinking too quickly, which can cause irritation at the back of the palate.
- Sudden temperature changes, such as walking from a warm house into cold air.
In many cases, the reverse sneeze is simply your dog’s way of clearing dust, allergens, or other small particles from the upper respiratory tract. If it happens occasionally and resolves quickly, it’s generally just a normal reflex.
Breeds That Snort More Often
Any dog can reverse sneeze, but some are far more prone to it. A large survey of 779 dogs in Spain found statistically significant predispositions based on size and breed. Toy dogs under 5 kg and small dogs between 5 and 14 kg were the most affected, with Yorkshire Terriers, Chihuahuas, Bichons, and Shih Tzus topping the list. The study also found that dogs over 10 years old and neutered females had higher rates of episodes.
Small dogs are more susceptible partly because their airways are narrower, meaning even minor irritation or swelling can trigger the reflex more easily.
Flat-Faced Breeds and Chronic Snorting
If your dog is a Pug, Bulldog, French Bulldog, Boston Terrier, or another flat-faced breed, the pig-like snorting may not be reverse sneezing at all. It may be a constant feature of their breathing. These breeds have a condition called brachycephalic obstructive airway syndrome, caused by the way their shortened skull bones reshape the respiratory tract.
The specific problems include nostrils that are abnormally narrow and may collapse inward during breathing, and a soft palate that’s too long for the shortened skull, partially blocking airflow into the windpipe. Together, these create the characteristic snoring, snorting, and wheezing that flat-faced dogs are known for. The severity varies widely. Some dogs snort only during exercise or excitement, while others struggle with noisy breathing throughout the day, especially in hot or humid weather.
Unlike reverse sneezing, which comes in short episodes, brachycephalic snorting tends to be chronic and worsens over time if the underlying anatomy isn’t addressed. Dogs with severe cases may benefit from surgical correction to widen the nostrils or shorten the soft palate, which can dramatically improve their quality of life.
Less Common Causes Worth Knowing
Occasionally, snorting signals something more than a harmless reflex. Nasal mites are tiny parasites that live inside a dog’s nasal passages and sinuses. An infestation typically causes frequent reverse sneezing, nosebleeds, nasal discharge, head shaking, facial itching, and high-pitched noisy breathing. If your dog’s snorting is accompanied by any of these signs, nasal mites are a real possibility, and they’re treatable once diagnosed.
A foreign body lodged in the nasal passage, like a blade of grass, foxtail seed, or small piece of debris, can also trigger persistent snorting and pawing at the nose. This tends to come on suddenly during or after outdoor activity, and usually affects one nostril. You might notice discharge or sneezing from only one side.
Reverse Sneezing vs. Tracheal Collapse
One condition that’s easy to confuse with reverse sneezing is tracheal collapse, where the cartilage rings supporting the windpipe weaken and flatten. Both can produce a honking sound, and in both cases dogs often extend their necks as if trying to open their airway. The key differences are timing and pattern.
Reverse sneezing episodes are brief (usually under a minute), happen sporadically, and the dog breathes completely normally between episodes. Tracheal collapse produces a dry, harsh, goose-honk cough that’s triggered by excitement, exercise, or pressure on the neck from a collar. It tends to worsen over time and recurs predictably with activity. Tracheal collapse is most common in small and toy breeds, particularly as they age, and it requires veterinary management.
How to Help During an Episode
When your dog is mid-reverse-sneeze, the most helpful thing you can do is stay calm. The episode will almost always resolve on its own in 15 to 30 seconds. Gently stroking your dog’s throat can encourage swallowing, which helps reset the soft palate and stop the spasm. Some owners find that briefly and lightly covering the nostrils (for just a second or two) prompts the dog to swallow and clears the episode faster. Offering a small amount of water afterward can help soothe the throat.
What doesn’t help: panicking, restraining your dog, or trying to pry their mouth open. Your dog can breathe during a reverse sneeze; it just doesn’t look or sound like it.
Signs That Snorting Needs Attention
Occasional reverse sneezing with no other symptoms is normal and doesn’t need treatment. But certain patterns suggest something else is going on. Pay attention if episodes are increasing in frequency or lasting longer than a minute. Nasal discharge (especially if bloody or from one side), labored breathing between episodes, blue or pale gums, persistent coughing, lethargy, or loss of appetite all warrant a veterinary visit. The same goes for snorting that started suddenly and won’t stop, which could indicate a foreign object or allergic reaction.
If you can, record a video of the snorting on your phone before the visit. The sound and body posture during the episode give a veterinarian far more diagnostic information than a verbal description alone.