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A Runny Nose in a Dog: One Nostril or Two Makes a Difference

A few clear drops after sniffing outdoors may disappear quickly. Persistent discharge, a change in color, bleeding or flow from only one nostril deserves veterinary attention. Irritation, infection, dental disease, a foreign object and other nasal problems can overlap. Do not put drops into the nose. Record the side, appearance and any change in breathing.

Unposed daylight phone photo of an owner gently observing clear discharge at one nostril of a calm dog

Laterality is useful information

Observe whether discharge comes from the left, right or both nostrils. Note clear fluid, mucus, pus, blood, odor or crust. Watch for sneezing fits, pawing at the face, noisy breathing, reverse sneezing, coughing, facial swelling or reduced airflow from one side. Photograph naturally visible material before wiping.

Review the hours before it started

Tall grass, dust, smoke, household fragrance, boarding, grooming and contact with coughing dogs are relevant. So are dental pain, recent anesthesia and a blow to the face. A dog who sniffs a foreign object into the nose may sneeze suddenly and repeatedly, but an object is not safe to search for with tweezers.

  • One nostril or both
  • Clear, cloudy, thick, bloody or foul smelling material
  • Sneezing, coughing, noisy breathing or facial rubbing
  • Exposure to grass awns, smoke, chemicals or sick dogs
  • Dental pain, reduced appetite or facial swelling
  • Vaccination history and recent boarding or daycare

Simple cleaning stays outside the nostril

Wipe the outer nose gently with damp clean gauze if the dog tolerates it. Do not use human decongestants, vapor rub, essential oils, antihistamines or medicated nasal products without veterinary instruction. Keep the dog away from smoke and aerosols while arranging advice.

Blood and airflow set the urgency

Seek emergency care for difficult breathing, blue or gray gums, collapse or severe facial trauma. Contact a veterinarian promptly for blood, one sided persistent discharge, pain, swelling, foul odor, fever, lethargy or refusal to eat. Limit contact with other dogs when an infectious respiratory illness is possible and ask the clinic how to arrive safely.

Reverse sneezing and coughing have an existing comparison guide. New snoring belongs to the sleep noise page. This article owns material leaving the nostrils and the observations that narrow the veterinary conversation.

Keep a daily note of whether discharge dries into crust, changes sides or appears with meals and drinking. If the dog has a long muzzle or recent dental disease, mention that specifically. Nasal problems can be linked to structures in the mouth as well as the airway, so a normal looking outer nose does not settle the question. Bring vaccination records and exact boarding or daycare dates when infectious exposure is possible. Call the clinic before entering a waiting room with a coughing or sneezing dog; they may use a separate arrival route to protect other patients. Do not share bowls, toys or close greetings while waiting for advice.

Sources and references

  1. Rhinitis and Sinusitis in Dogs, Merck Veterinary Manual
  2. Canine infectious respiratory disease, American Veterinary Medical Association
  3. When is it a pet emergency?, American Animal Hospital Association

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