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Dog Nosebleeds: Causes and When to Worry

NYP TeleVet Team
September 10, 2026
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Seeing blood coming from your dog’s nose can be alarming. A nosebleed, called epistaxis, can be caused by something minor, like a bump to the nose, or by something more serious, like an infection, a tumor or a bleeding disorder. Here’s what to do right away and when a dog nosebleed needs a vet.

Common causes of dog nosebleeds

Injury

A knock to the nose during play, running into furniture or a scratch can cause a short nosebleed.

Something stuck in the nose

Grass seeds, sticks and other objects can get lodged in the nose. Dogs often sneeze hard, paw at their face and bleed from one nostril. Our article on reverse sneezing in dogs explains a common, harmless sneezing pattern that can be confused with this.

Nasal infections

Bacterial or fungal infections, such as aspergillosis, can cause bleeding, thick discharge and sneezing.

Dental disease

A tooth root abscess, especially in an upper tooth, can break into the nasal passages. Our article on why your pet’s dental health matters explains the link.

Nasal tumors

In older dogs, a nosebleed from one nostril that keeps coming back can be a sign of a nasal tumor. Long-nosed breeds may be at higher risk.

Bleeding disorders

Problems with blood clotting can cause nosebleeds, often from both nostrils, along with bruising or bleeding elsewhere. Causes include:

High blood pressure

High blood pressure, sometimes linked to kidney disease or hormone problems, can also cause nosebleeds.

First aid for a dog nosebleed

  1. Stay calm. Excitement raises blood pressure and can make bleeding worse.
  2. Keep your dog quiet and still.
  3. Apply a cold compress, wrapped in a cloth, to the bridge of the nose (not the nostrils).
  4. Don’t tilt your dog’s head back.
  5. Don’t put anything inside the nose.
  6. Make sure your dog can breathe through their mouth.
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When is a nosebleed an emergency?

Go to a vet right away if:

Our guide to pet emergency signs explains other urgent symptoms.

How do vets find the cause?

Your vet may check:

Our article on understanding your pet’s blood work results explains common blood tests.

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How are nosebleeds treated?

Treatment depends on the cause. It may include removing a foreign object, treating an infection, dental work, managing a clotting disorder or treating a tumor.

Frequently asked questions

Is a dog nosebleed from one nostril serious?

It can be minor, but repeated one-sided nosebleeds should be checked for foreign objects, infection or tumors.

Can sneezing cause a nosebleed?

Hard, repeated sneezing can irritate the nose, but frequent sneezing with blood needs a vet.

Worried about a nosebleed? Ask a vet

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Our vets can’t prescribe medication, but they’ll tell you what’s likely needed and when an in-person visit is the next step.

Sources

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