Rhinitis and Sinusitis in Dogs: Causes, Tests and Care

By Dr Duncan Houston

Repeated sneezing, congestion or discharge from the nose can interfere with a dog's sleep, appetite and comfort. These signs deserve attention when they persist, recur or occur with pain or illness.

Quick Answer

Rhinitis means inflammation inside the nose, and sinusitis means inflammation of the sinuses; neither term automatically means a bacterial infection. Causes include infections, foreign material, dental disease, chronic inflammation and tumours. Persistent, one-sided or bloody discharge needs a veterinary examination, while difficult breathing is an emergency.

Why the nose becomes inflamed

Respiratory infections can cause acute nasal signs, sometimes with coughing or exposure to other sick dogs. Bacteria may complicate another problem rather than being the original cause. Fungal disease, including nasal aspergillosis, requires specific investigation and treatment.

A grass seed or other foreign body can produce sudden forceful sneezing, pawing at the face or one-sided discharge. Diseased upper teeth may affect nearby nasal tissues. Chronic inflammatory rhinitis can persist after other causes have been investigated. Tumours are another important possibility, particularly with progressive signs. Allergy or an irritant is possible, but should not be assumed to explain a persistent runny nose.

Signs and urgency

When it is an emergency

Difficulty moving air is more urgent than the colour of the discharge. Keep your dog calm and cool, avoid pressure around the neck and call ahead while arranging transport. Do not force the mouth closed, pack the nostrils or attempt a home nasal flush. Heavy or ongoing nosebleeding also needs urgent advice.

What the examination and tests can show

Tell the vet when signs began, whether one or both nostrils are affected, and whether there has been dental disease, grass-seed exposure, travel or contact with other dogs. Photographs of discharge and a short breathing video can help, but cannot replace examination.

The vet checks the mouth, teeth, face, airflow and general health. Persistent cases may require CT imaging to assess nasal structures, followed by rhinoscopy and carefully selected samples. Tissue biopsy, cytology and culture help distinguish inflammation, fungal disease and cancer. Not every dog needs every test, and a surface swab alone may identify secondary bacteria without explaining the main problem.

Treatment follows the cause

A foreign body needs removal; dental disease needs dental treatment. Fungal infections may need specialist procedures and antifungal medication. Antibiotics are used when a bacterial component warrants them, rather than automatically for all coloured discharge. Chronic inflammatory disease may require an ongoing management plan after other causes are excluded.

For a tumour, the type and extent determine options such as radiation therapy and supportive care. Steroids can affect infections and diagnostic results, so do not start leftover medication while waiting for investigation.

Safe support at home

1. Keep the environment free of smoke, aerosol fragrances and dusty bedding.
2. Gently wipe discharge from the outside of the nostrils with a damp soft cloth.
3. Keep water available and report reduced eating or drinking.
4. Use prescribed treatment as directed and attend planned reviews.
5. Ask whether contact with other dogs should be limited if an infectious cause is possible.

Do not use human cold remedies, decongestants, essential oils or medicated nasal drops without veterinary instruction. Avoid hot steam, which can burn or increase distress. Humidification or nebulisation is appropriate only when your vet considers it useful and gives safe instructions.

Common mistakes

Yellow or green mucus does not prove that antibiotics are the only treatment needed. Repeated short-lived improvement followed by relapse should prompt reassessment. One-sided discharge is a clue, not a diagnosis, and an apparently normal appetite does not exclude significant nasal disease.

Frequently Asked Questions

Is rhinitis contagious?

Some infectious causes spread between dogs; many other causes do not. Precautions depend on the diagnosis.

Can chronic rhinitis be cured?

Some causes can be resolved, while chronic inflammatory disease may need long-term control. The investigation helps set realistic expectations.

Is reverse sneezing the same thing?

No. Reverse sneezing is a breathing episode with several possible triggers. Frequent new episodes or accompanying discharge still warrant assessment.

Sources

Merck Veterinary Manual: rhinitis and sinusitis; Merck: owner guidance; Animal Medical Center: nasal tumours.

Finding the cause is the best route to comfortable breathing and fewer repeated treatment cycles.

ASK A VET™ can help you organise nasal symptoms and questions about investigations. Breathing difficulty needs immediate in-person veterinary care.