Home › Blog › Why Does My Dog Keep Sneezing? Causes and When to See a Vet

Why Does My Dog Keep Sneezing? Causes and When to See a Vet

Occasional sneezing is completely normal in dogs, but persistent or unusual sneezing can indicate infection, allergies, a foreign body or other health issues. This guide helps UK owners understand what's causing the sneezing and when veterinary advice is needed.

Normal Sneezing in Dogs

Dogs sneeze for many of the same reasons humans do — to clear irritants from the nasal passage, in response to dust or grass, or as part of play. Play sneezing is a well-documented behaviour where dogs deliberately sneeze during play as a calming or communicative signal to other dogs, indicating that rough behaviour is just play.

Brachycephalic breeds (Pugs, French Bulldogs, Bulldogs) tend to sneeze more frequently than other breeds due to their compressed facial anatomy. Reverse sneezing — a dramatic rapid inhaling episode that sounds alarming — is common in small breeds and most dogs and is usually benign, resolving within seconds when the dog swallows or the owner gently massages the throat.

Occasional sneezing following exposure to dust, pollen, smoke or strong scents is normal and doesn't require investigation. The question to ask is whether the sneezing is more frequent, more forceful, or accompanied by other signs that suggest something more is going on.

Allergies and Environmental Triggers

Seasonal allergies (atopy) can cause sneezing alongside other signs: itchy skin, watery eyes, and paw licking. Grass pollen is a major seasonal trigger for UK dogs in spring and summer. House dust mites, mould spores and certain cleaning products can trigger year-round nasal irritation.

Allergic sneezing is typically bilateral (both nostrils) and associated with clear discharge. It may worsen at certain times of year or in certain environments.

For dogs with confirmed allergies, management options include antihistamines (some human antihistamines are safe for dogs but always check with your vet for dose), prescription allergy medications, and in some cases allergen-specific immunotherapy. Wiping your dog's paws and face after walks can reduce the pollen load brought indoors.

Infections: Kennel Cough and Other Causes

Infectious causes of sneezing include kennel cough (infectious tracheobronchitis) — which primarily causes coughing but can include sneezing — and, less commonly, canine influenza and other respiratory viruses.

Bacterial infections of the nasal passages (rhinitis) or sinuses (sinusitis) can cause persistent sneezing with mucopurulent (thick, coloured) discharge. Aspergillosis, a fungal infection, can affect the nasal cavity of dogs and causes sneezing with a bloody or purulent discharge, often alongside depigmentation of the nasal planum.

Vaccination protects against several common respiratory pathogens. If your dog's vaccinations are not up to date, this is a good time to review them.

Foreign Bodies in the Nasal Passage

One of the most common causes of sudden violent sneezing in dogs — particularly active dogs that spend time outdoors — is a grass awn or other foreign body lodged in the nasal passage. The characteristic presentation is sudden, intense sneezing (often paroxysmal) with pawing at the face, sometimes progressing to a bloody or one-sided discharge.

Grass seeds (particularly foxtails and wild barley) are notorious for penetrating soft tissues and migrating. A grass seed in the nose, if not removed, can track into deeper structures causing serious infection.

If your dog suddenly starts sneezing intensely, particularly after outdoor exercise in summer, a grass seed in the nose is high on the list. This requires veterinary assessment — nasal endoscopy under sedation may be needed to locate and remove the seed.

Nasal Tumours and Polyps

Persistent sneezing in an older dog — particularly when accompanied by one-sided bloody discharge, facial swelling or apparent pain around the nose — raises the possibility of a nasal tumour. Nasal tumours are more common in long-nosed (dolichocephalic) breeds.

Nasal polyps (benign growths in the nasal passage) can also cause chronic sneezing and discharge. These are more common in cats than dogs but do occur.

Diagnosis requires imaging (CT or MRI) and nasal biopsy, typically at a referral centre. Treatment options depend on the type of tumour found. While not all nasal growths are malignant, the presentation warrants prompt veterinary investigation.

Find a Vet Near You

Persistent sneezing, bloody discharge or sudden severe sneezing all warrant a vet visit. Use CompareMyVet at app.comparemyvet.uk to find and compare local vet practices and book an appointment promptly when needed.