Symptom guide

Why Is My Dog Sneezing (or Reverse Sneezing)?

Play sneezes, irritants, grass seeds and reverse sneezing explained: why dogs sneeze, how to stop a reverse sneeze, and the signs that need a vet.

Updated October 2026 · 6 min read · By the Hushku editorial team · 2 sources

Monitor at home; call your vet if it worsens. Watch at home; same day for violent sneezing or nosebleeds

Short answer

Occasional sneezing is normal, and many dogs 'play sneeze' when excited. Sudden, violent sneezing with pawing at the nose may mean a grass seed is stuck up there and needs a vet the same day. Reverse sneezing, loud snorting inhalations, looks alarming but is usually harmless. See a vet for sneezing that lasts more than a few days, nosebleeds, or thick or one-sided discharge.

Key facts

Reverse sneezing looks alarming but is usually harmless.
Sudden violent sneezing after a walk may mean a grass seed in the nose.
One-sided discharge or nosebleeds need a vet, especially in older dogs.
Infected upper tooth roots can cause sneezing.

This guide is general information, not a diagnosis. If your pet seems unwell, or you're worried, call your vet.

Overview

Sneezing clears irritants from the nose. Dust, pollen, perfume or a sniff of something interesting can all set it off. Dogs also sneeze as a social signal during play, often with a play bow or a wagging tail.

Reverse sneezing is different. Your dog suddenly stands still, extends its neck and makes loud, rapid snorting or honking inhalations through the nose for a few seconds to a minute. It's caused by a spasm at the back of the nose and throat, often triggered by excitement, pulling on the lead, eating or drinking quickly, or irritants. It's especially common in small and flat-faced breeds. It isn't dangerous on its own, though frequent bouts can be a sign of nasal irritation.

To stop a reverse sneeze, stay calm and gently stroke your dog's throat, or briefly cover the nostrils so it swallows. Most episodes stop on their own.

Go to a vet now if you see

A nosebleed that won't stop, or bleeding from both nostrils without injury
Difficulty breathing, or blue or pale gums
Violent sneezing and pawing at the face after a walk (possible grass seed)
Sneezing after possible exposure to rat poison (can cause bleeding)

Common causes

1. Irritants and play
Usually mild
Dust, pollen, smoke, sprays and excitement. Occasional sneezes in a happy dog are normal.
2. Reverse sneezing
Usually mild
Snorting inhalations, common in small and flat-faced dogs. Harmless unless very frequent.
3. Grass seeds and foreign bodies
Serious
Sudden, violent sneezing, pawing at the nose and sometimes a nosebleed from one nostril, often after a walk through long grass.
4. Respiratory infections
Needs a vet
Sneezing with nasal discharge, coughing and sometimes fever, often as part of kennel cough.
5. Dental disease
Needs a vet
Infected upper tooth roots sit close to the nasal passages and can cause sneezing and one-sided discharge.
6. Nasal mites and fungal infections
Needs a vet
Less common causes of persistent sneezing, discharge and nosebleeds.
7. Nasal tumours
Serious
Mainly in older dogs: one-sided discharge, nosebleeds, noisy breathing and sometimes facial swelling.

What you can do at home

Keep your home free of smoke, strong fragrances and aerosol sprays.
Use a harness instead of a collar if pulling triggers reverse sneezing.
Check your dog's coat, ears, paws and nose for grass seeds after walks in summer.
Keep a short video of the episode to show your vet.

When to see a vet

Sneezing that lasts more than a few days
Thick, coloured or bloody nasal discharge, or discharge from one nostril only
Reverse sneezing that's becoming more frequent
Sneezing with coughing, lethargy or loss of appetite
Facial swelling, or bad breath with sneezing

Prevention

Avoid long grass with seed heads in summer, especially with spaniels and other dogs with feathery ears and feet
Keep up with dental checks and tooth brushing
Vaccinate against kennel cough if your dog mixes with lots of other dogs

Free tools for this

Dog and cat symptom checker

Sources

We check guides against veterinary sources and update them when guidance changes. How we write and review.

Questions.

Is reverse sneezing an emergency?

No. It sounds dramatic, but dogs breathe normally once it stops. See a vet if episodes become frequent or come with discharge or nosebleeds.

Can dogs have hay fever?

Dogs with environmental allergies more often get itchy skin, paws and ears than sneezing, but some do sneeze and have runny eyes.

Why does my dog sneeze when playing?

Play sneezing is a communication signal that seems to say 'this is just play'. It's normal.

Key facts

Overview

Go to a vet now if you see

Common causes

1. Irritants and play

2. Reverse sneezing

3. Grass seeds and foreign bodies

4. Respiratory infections

5. Dental disease

6. Nasal mites and fungal infections

7. Nasal tumours