Why Is My Dog Sneezing When Breathing?
Sneezing that occurs during quiet breathing or at rest -- rather than in response to a specific trigger like eating, drinking, or excitement -- can be a more notable sign. It may indicate ongoing nasal irritation or an issue within the nasal cavity that warrants closer attention.
Published: 2026-07-29 | Updated: 2026-07-29 | Reading time: 5 min
Quick Answer
Frequent sneezing during normal breathing or while at rest may be caused by nasal irritation from allergens, a foreign object in the nasal passage, nasal mites, a respiratory infection, or in some cases a nasal mass or polyp. Because several of these causes require veterinary diagnosis and treatment, a dog that sneezes persistently without an obvious trigger should be examined by a veterinarian.
SYMPTOM TRIAGE
Answer a few questions about your dog's signs and receive general guidance on how urgently to seek veterinary care.
This tool does not diagnose conditions or replace a veterinarian.
Possible Causes of Sneezing During Normal Breathing
Nasal Irritation from Allergens
Allergic rhinitis is one of the more common reasons dogs sneeze frequently throughout the day. Inhalant allergies to pollen, mould, dust mites, or household chemicals can cause persistent inflammation of the nasal lining.
Signs that may accompany allergic sneezing include:
- Clear nasal discharge
- Itchy skin, particularly the paws, ears, and face
- Red or watery eyes
- Occasional scratching at the muzzle
Allergic sneezing often has a seasonal pattern, depending on the allergen involved.
Foreign Body in the Nasal Passage
Dogs explore the world with their noses, and small objects can become lodged in the nasal cavity. Common foreign bodies include:
- Grass awns (foxtails)
- Seeds
- Small twigs or plant material
- Splinters or other debris
A foreign body usually causes sneezing from one nostril and may produce discharge that progresses from clear to blood-tinged or pus-like over time. The dog may also paw at the nose or rub the face on the ground. This is a situation that requires veterinary attention because foreign bodies can migrate deeper or cause infection if left in place.
Nasal Mites
Nasal mites (Pneumonyssoides caninum) are tiny parasites that live inside the nasal passages of dogs. They can cause persistent sneezing, nasal discharge, head shaking, and sometimes nosebleeds. Nasal mites are transmitted through direct nose-to-nose contact with an infected animal.
A veterinarian can diagnose nasal mites and prescribe appropriate treatment to eliminate them.
Respiratory Infection
Bacterial, viral, or fungal infections of the nasal cavity and upper respiratory tract can cause sneezing during normal breathing. Infections may develop after exposure to other animals at kennels, parks, or shelters.
Signs that may suggest an infection include:
- Thick or coloured nasal discharge
- Sneezing from both nostrils
- Lethargy or reduced energy
- Fever or reduced appetite
- Swollen lymph nodes under the jaw
Some infections, such as canine influenza or bordetella, may also involve coughing.
Nasal Tumours or Polyps
In older dogs, persistent sneezing that does not respond to basic treatment can sometimes be associated with nasal masses, such as benign polyps or malignant tumours. Nasal tumours are more commonly diagnosed in medium to large breeds and senior dogs.
Possible signs include:
- Progressive sneezing that worsens over weeks or months
- Persistent discharge, often from one nostril
- Nosebleeds
- Facial swelling or asymmetry
- Noisy breathing or a change in the sound of the bark
Early veterinary evaluation is important, because treatment options and outcomes vary depending on the type and stage of the growth.
What to Observe at Home
While waiting for a veterinary appointment, it can be helpful to note:
- Whether sneezing comes from one nostril or both
- The colour and consistency of any nasal discharge
- Whether the sneezing is worsening, improving, or staying the same
- Any other signs such as pawing at the face, coughing, or reduced appetite
- When the sneezing started and whether any changes preceded it, such as a new environment, recent boarding, or exposure to tall grass
Sharing these observations with your veterinarian can assist in the diagnostic process.
When to Contact a Veterinarian
Seek prompt veterinary care if you notice:
- Persistent sneezing that occurs daily or during rest without an obvious cause
- Discharge that is yellow, green, or contains blood
- Discharge from only one nostril
- Frequent nosebleeds
- Pawing at the nose, rubbing the face, or signs of pain
- Noisy breathing, wheezing, or open-mouth breathing
- Swelling or deformity of the face or nose
- Lethargy, fever, or loss of appetite
- Sneezing that has progressively worsened over time
A non-urgent vet visit may be appropriate when:
- Sneezing is intermittent and mild
- Discharge is clear and minimal
- The dog is otherwise healthy, active, and eating normally
- Sneezing has been present for only a short duration
Frequently Asked Questions
Why does my dog sneeze while lying down?
Sneezing while at rest may indicate ongoing nasal irritation rather than a response to an external trigger such as dust or excitement. Causes can include allergies, a lodged foreign body, nasal mites, or an infection. If the sneezing is persistent and occurs in different positions and settings, a veterinary examination is recommended.
Can nasal mites cause sneezing?
Yes. Nasal mites are parasites that inhabit the nasal passages of dogs and can cause persistent sneezing, nasal discharge, and occasional nosebleeds. They are treated with antiparasitic medications prescribed by a veterinarian after diagnosis.
How do I know if my dog has something stuck in its nose?
Signs of a nasal foreign body include sudden, persistent sneezing (often from one nostril), pawing at the nose, rubbing the face, and discharge that may become blood-tinged. If you suspect something is lodged in your dog's nose, do not attempt to remove it yourself. A veterinarian can safely locate and extract the object.
Is sneezing a sign of a nasal tumour in dogs?
Sneezing alone is not enough to indicate a nasal tumour. However, persistent, progressive sneezing -- especially from one nostril, accompanied by nosebleeds, facial swelling, or discharge that does not resolve -- can be associated with nasal masses. Older dogs showing these signs should be evaluated by a veterinarian, as early detection can influence treatment options.
SYMPTOM TRIAGE
If your dog sneezes frequently during rest or normal breathing and you are unsure of the cause, use the symptom triage tool to assess the signs and get general guidance on next steps.
Sources
- Merck Veterinary Manual: "Disorders of the Nasal Cavity" (merckvetmanual.com)
- Merck Veterinary Manual: "Nasal Mites" (merckvetmanual.com)
- VCA Animal Hospitals: "Sneezing and Nasal Discharge in Dogs" (vcaanimalhospitals.com)
- American Kennel Club: "Why Do Dogs Sneeze?" (akc.org)
Disclaimer
This article and the PawAI Symptom Triage tool provide general educational information only. They cannot examine your pet, make a diagnosis, or replace advice from a licensed veterinarian. Contact a veterinarian promptly if symptoms are severe, worsening, persistent, or accompanied by emergency warning signs.