Is reverse sneezing dangerous in dogs?

Generally no. Reverse sneezing, where a dog makes a loud snorting sound pulling air in rather than pushing it out, looks alarming but is usually harmless and passes within a minute on its own. Frequent episodes are still worth mentioning to your vet at a routine visit.

My dog sneezed and there was blood — is this serious?

Yes, this needs a same-day vet visit. Blood with sneezing, especially from one nostril, can indicate a foreign object such as a grass seed lodged in the nose, or another cause needing investigation, rather than something to wait and watch.

Can grass seeds cause sneezing in dogs?

Yes, a grass seed lodged up the nose typically causes sudden, violent, repeated sneezing, sometimes with pawing at the face or bleeding from one nostril. This is more common after walking through long grass in summer and usually needs a vet to remove the seed.

Can dental problems really cause a dog to sneeze?

Yes, though it is less obvious than the other causes. The roots of the upper teeth sit close to the nasal passages, so a tooth root abscess or significant dental disease can occasionally cause chronic sneezing or nasal discharge, which usually resolves once the underlying dental problem is treated.

Can allergies make a dog sneeze regularly?

Yes, seasonal or environmental allergies can cause repeated sneezing in some dogs, often alongside itchy skin or watery eyes. If sneezing seems to follow a pattern with the seasons or a particular environment, mention it to your vet, since it is worth distinguishing from other causes such as a lodged foreign object.

Why is my dog sneezing?

Occasional sneezing is usually nothing to worry about in dogs and often comes from a simple irritant like dust, pollen or a strong smell. Sudden, repeated or violent sneezing, especially with blood, discharge, or coming from one nostril only, is different and is worth getting checked by your vet.

Usually not urgent

This is common and often manageable at home — but see a vet if it persists, gets worse, or comes with other changes.

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The everyday causes

Dust, strong perfumes, cleaning sprays and pollen are all common irritants that can set off a sneeze or two in an otherwise healthy dog, in much the same way they might make a person sneeze. This kind of sneezing is usually brief and does not repeat once the irritant has passed.

Reverse sneezing, where a dog makes a loud snorting sound while pulling air in rather than pushing it out, is a different and very common occurrence in dogs, particularly smaller breeds. It looks alarming but is generally harmless and usually stops on its own within a minute or so.

When it points to something more

A grass seed or other foreign object lodged up the nose typically causes sudden, violent, repeated sneezing, sometimes with a dog pawing at their face or one-sided nasal bleeding. This is more common after walking through long grass, particularly in summer, and usually needs a vet to remove it.

Sneezing alongside a cough, nasal discharge, or reduced energy can point towards an upper respiratory infection, sometimes referred to as kennel cough, which is generally manageable but is worth a vet visit to confirm and to avoid passing it on to other dogs. Chronic sneezing can also, less commonly, be linked to dental disease, since a tooth root abscess sits close to the nasal passages.

Red flags to see a vet about

Contact your vet if sneezing is accompanied by blood, comes from one nostril only, is paired with facial swelling, continues for more than a couple of days, or your dog seems generally unwell, off their food, or is pawing persistently at their face or nose.

A single episode of reverse sneezing in an otherwise well dog is rarely a reason to worry, but frequent episodes are worth mentioning at a routine check-up so your vet can rule out an underlying cause.

Reducing everyday irritants

If sneezing seems to follow walks through long grass or fields, regular brushing after a walk helps remove pollen, seeds and dust from your dog's coat before they have a chance to work their way towards the face or nose. Checking paws, ears and around the face after walks in long grass during summer is worth doing anyway, since grass seeds cause problems in those areas too.

At home, choosing fragrance-free cleaning products around your dog's usual resting areas can reduce the everyday irritants that trigger occasional sneezing, particularly for a dog who seems sensitive to strong smells generally. The same goes for scented candles, air fresheners and strong perfumes used close to where your dog spends most of their time.

What a vet visit for sneezing involves

A vet examining a sneezing dog will typically look inside the nostrils and mouth as far as they can see, check the teeth and gums for signs of dental disease, feel along the face for any swelling or pain, and ask how long the sneezing has been going on and whether anything seems to trigger it.

If a foreign object such as a grass seed is suspected but cannot be seen easily, further investigation under sedation or anaesthetic may be needed to look further up the nasal passage and remove it. This sounds more dramatic than it usually is in practice, and most dogs recover quickly once the seed is out.

What can help

Things we stock that owners commonly use alongside a vet’s advice — not a substitute for it.

Reusable Washable Puppy Training Pad

A quilted, machine-washable training pad that absorbs accidents and locks in moisture with a leak-resistant base. Reusable for puppy toilet training and senior dogs, in several bone and paw prints.

From£7.99

Microfibre Pet Drying Robe

A super-absorbent microfibre drying robe that soaks up the wet fast after baths, swims and walks.

From£10.99

Absorbent Microfibre Dog Drying Robe

A super-absorbent microfibre drying robe with a handy front pocket to dry your dog off fast.

From£13.99

Large Self-Cleaning Slicker Brush for Mats and Tangles

A self-cleaning slicker brush with fine, bead-tipped wire pins that gently lift loose undercoat, mats and tangles from short or long-haired pets. A one-click button releases the collected fur for fuss-free cleaning. Cat-ear shaped design.

£18.99

Common questions

Is reverse sneezing dangerous in dogs?: Generally no. Reverse sneezing, where a dog makes a loud snorting sound pulling air in rather than pushing it out, looks alarming but is usually harmless and passes within a minute on its own. Frequent episodes are still worth mentioning to your vet at a routine visit.
My dog sneezed and there was blood — is this serious?: Yes, this needs a same-day vet visit. Blood with sneezing, especially from one nostril, can indicate a foreign object such as a grass seed lodged in the nose, or another cause needing investigation, rather than something to wait and watch.
Can grass seeds cause sneezing in dogs?: Yes, a grass seed lodged up the nose typically causes sudden, violent, repeated sneezing, sometimes with pawing at the face or bleeding from one nostril. This is more common after walking through long grass in summer and usually needs a vet to remove the seed.
When should I take my sneezing dog to the vet?: See a vet if sneezing includes blood, comes from one nostril only, is paired with facial swelling, continues for more than a couple of days, or your dog seems generally unwell or off their food. Occasional, brief sneezing in a bright, well dog is usually nothing to worry about.
Can dental problems really cause a dog to sneeze?: Yes, though it is less obvious than the other causes. The roots of the upper teeth sit close to the nasal passages, so a tooth root abscess or significant dental disease can occasionally cause chronic sneezing or nasal discharge, which usually resolves once the underlying dental problem is treated.
Can allergies make a dog sneeze regularly?: Yes, seasonal or environmental allergies can cause repeated sneezing in some dogs, often alongside itchy skin or watery eyes. If sneezing seems to follow a pattern with the seasons or a particular environment, mention it to your vet, since it is worth distinguishing from other causes such as a lodged foreign object.

Sources

Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.

Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.