Dogs do not catch human colds, but they get respiratory infections — kennel cough, canine influenza, and bacterial rhinitis all cause sneezing, coughing, and nasal discharge. Multi-dog households and kennels are higher risk.

Why does my dog sneeze on the grass?

Sniffing stirs dust, pollen, and grass particles into the nostrils. Some dogs also 'play sneeze' during excitement — a short burst of sneezes while bowing or playing is normal social behaviour, not illness.

Is bloody sneeze an emergency?

Yes — blood from one or both nostrils needs urgent vet assessment. Causes include foreign bodies, fungal infection, dental abscess, trauma, or tumours. Do not wait to see if it stops on its own.

Do dental problems cause sneezing in dogs?

Yes — infected upper premolars and molars sit close to the nasal cavity. An abscess can drain into the nose, causing one-sided sneezing, foul breath, and sometimes bloody or pus-like discharge.

Dog Health

Why Is My Dog Sneezing? UK Causes, Reverse Sneezing & When to Worry

Published 25 June 2026Last updated 25 June 20264 min read

Quick answer

Occasional sneezing is normal — dogs clear dust, pollen, and strong scents from their nose. Frequent sneezing with green or bloody discharge, one-sided symptoms, pawing at the face, or loss of appetite needs a vet — often infection, a grass seed in the nostril, or dental disease. Reverse sneezing sounds alarming but is usually harmless.

Normal sneezing vs illness

A few sneezes after sniffing grass, rolling in dust, or entering a warm house is a normal reflex. According to Blue Cross, dogs explore the world nose-first, so irritants are common.

Usually harmless:

Single or occasional sneezes outdoors
Sneezing after dust from hoovering or dry weather
Play sneezing during rough-and-tumble — short bursts with a relaxed body
Brief reverse sneezing episodes — see Reverse sneezing in dogs

Needs investigation:

Sneezing many times daily for more than a few days
Yellow, green, or bloody nasal discharge
One nostril affected more than the other
Pawing at the face, rubbing nose on carpet
Foul smell from the nose or mouth
Lethargy, fever, or reduced appetite

Common causes in UK dogs

Cause	Typical signs	Notes
Dust, pollen, scents	Clear discharge, seasonal pattern	May overlap with dog allergies
Kennel cough	Honking cough, sneezing, runny nose	Spread at parks, kennels, day care — see Kennel cough
Foreign body	Sudden violent sneezing, one nostril	Grass seeds common in summer — vet removal needed
Dental abscess	One-sided discharge, bad breath	Upper back teeth — see Dog dental care UK
Nasal infection	Chronic discharge, facial pain	Fungal and bacterial — diagnosis needs vet swabs
Nasal tumours	Progressive one-sided bleeding	More common in senior dogs — early vet check matters

Reverse sneezing — not the same as sneezing

Many owners confuse reverse sneezing with normal sneezing. During a reverse sneeze, your dog pulls air in rapidly through the nose with a snorting or honking sound, neck extended. Episodes usually last seconds to a minute and resolve on their own. If episodes are frequent or paired with discharge, book a vet check.

Play sneezing

Dogs sometimes sneeze deliberately during play to signal friendly intent. If your dog is otherwise well and sneezes only during excitement, this is behavioural — not a medical problem.

When to see a vet urgently

Phone your vet the same day or use emergency out-of-hours care if:

Blood from the nose — fresh or clotted
Sudden violent sneezing that will not stop, especially after walking in long grass
Difficulty breathing, open-mouth breathing, or blue or pale gums — see Pale gums in dogs
Head trauma or suspected poisoning
Puppy or unvaccinated dog with discharge and lethargy
Sneezing with collapse or extreme distress

Book a routine appointment within a few days for persistent sneezing without emergency signs — chronic discharge rarely resolves without treatment.

Home monitoring before your appointment

While waiting for a vet visit, note:

When sneezing started and whether it is worsening
One or both nostrils — photograph any discharge colour if safe
Recent walks — long grass, foxholes, or dusty areas
Other symptoms — coughing, eye discharge, bad breath
Vaccination and kennel cough history

What you can do at home:

Avoid strong air fresheners, smoke, and dusty bedding
Use a damp cloth to gently wipe clear discharge from the nostrils
Keep your dog calm and hydrated — offer fresh water
Do not give human cold medicines — many are toxic to dogs

What not to do:

Do not poke cotton buds into the nostril
Do not delay if blood or breathing difficulty is present
Do not assume grass seeds will work their way out — they often migrate deeper

What your vet may do

Examination may include checking teeth, nostrils, lymph nodes, and temperature. Your vet might recommend:

Sedated nasal exam or rhinoscopy for foreign bodies
Dental X-rays if tooth root disease is suspected
Swabs or imaging for chronic or one-sided disease
Antibiotics or anti-inflammatories for infection — vet prescribed only

Treatment depends on cause — grass seeds are removed under sedation; dental abscesses need extraction or root treatment; kennel cough is usually managed with rest and vet-directed care.

Sources & further reading

Facts in this guide are rewritten in plain English from publicly available UK advice. We name the organisation where a specific point comes from their guidance. Links below go to the original pages — use them to read the source material directly.

PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Guidance checked against sources listed below (last updated 2026-06-25).

Related guides

Frequently Asked Questions

Can dogs get colds?: Dogs do not catch human colds, but they get respiratory infections — kennel cough, canine influenza, and bacterial rhinitis all cause sneezing, coughing, and nasal discharge. Multi-dog households and kennels are higher risk.
Why does my dog sneeze on the grass?: Sniffing stirs dust, pollen, and grass particles into the nostrils. Some dogs also 'play sneeze' during excitement — a short burst of sneezes while bowing or playing is normal social behaviour, not illness.
Is bloody sneeze an emergency?: Yes — blood from one or both nostrils needs urgent vet assessment. Causes include foreign bodies, fungal infection, dental abscess, trauma, or tumours. Do not wait to see if it stops on its own.
Do dental problems cause sneezing in dogs?: Yes — infected upper premolars and molars sit close to the nasal cavity. An abscess can drain into the nose, causing one-sided sneezing, foul breath, and sometimes bloody or pus-like discharge.