Nose cancer (nasal and sinus tumors) makes up about 1% to 2% of tumors in dogs. Nearly all are malignant, and adenocarcinoma is the most common type.1,2 It mostly affects dogs around 9 to 10 years old, more often long- and medium-nosed breeds.1,3 The usual first signs are a long-lasting nasal discharge, nosebleeds, sneezing and noisy breathing, often starting on one side.1,4,5 These tumors mainly grow locally and spread late.1,2 Radiation is the main treatment. Without treatment, most dogs live about 3 to 5 months; with a full course of radiation, dogs live on average about a year to a year and a half.1,4,5,6
See your vet promptly if your dog has:
- A nosebleed, or nasal discharge with mucus, pus or blood that keeps coming back1,4
- Swelling over the bridge of the nose, below an eye or on the roof of the mouth4,1
- A bulging or watery eye on one side1
Go to a vet right away if your dog:
Many other things cause sneezing and nosebleeds. See dog sneezing and dog nosebleeds.
What the Research Says
- Tumors are a leading cause of long-lasting nasal disease. In a South African study of 75 dogs with chronic nasal problems, nearly half had a tumor.7
- Nosebleeds matter. Untreated dogs with nosebleeds lived a median of 88 days, compared with 224 days for dogs without them.8
- Stereotactic radiation works in fewer sessions. In a 2023 study of 182 dogs, median survival was 441 days, with few short-term side effects.9
- Bone damage near the brain shortens survival. In a 2024 Japanese study, dogs whose tumor had broken through the bone between the nose and brain lived 179 days, compared with 306 days.10
Signs of Nose Cancer in Dogs
- Chronic discharge from the nose, with mucus, pus or blood. It often starts on one side, but both sides may be affected by the time a dog is seen.1,3,7
- Nosebleeds1,4
- Sneezing, reverse sneezing and noisy breathing, especially at night6,4
- Less airflow through one nostril6
- Swelling or a change in the shape of the face, or facial pain1,7
- A bulging eye or tearing1
- Late signs: seizures, sudden blindness, circling or behavior changes, which in rare cases are the only signs2,1
Signs usually worsen over weeks to months, but nosebleeds and seizures can get worse quickly.4 Because nasal cancer looks like many other nasal problems, it is often diagnosed late. Any discharge or nosebleed that keeps coming back should be checked.11,12
Which Dogs Are at Risk?
Nasal tumors usually affect dogs around 9 to 10 years old. Long-nosed and medium-nosed breeds are at higher risk than flat-faced breeds, and males are affected more often than females.1,3
Diagnosis
- CT scan of the nose and head is "far superior" to X-rays, showing the tumor's extent and any bone damage.1,12
- Biopsy, taken under anesthesia through a scope (rhinoscopy) or guided by CT, confirms the diagnosis. More than one sample may be needed.1,5
- Staging includes bloodwork, chest imaging and a needle sample of the jaw lymph nodes. Fewer than 1 in 4 dogs has spread to lymph nodes when diagnosed.5,2
Treatment Options
| Option | What it involves | Typical outcome |
|---|---|---|
| Full-course radiation | Weekday sessions over several weeks under brief anesthesia4 | About 1 year on average; most tumors eventually regrow4,5 |
| Stereotactic radiation | A few high-precision sessions9 | Median about 15 months in one large study9 |
| Palliative radiation | A shorter course to ease signs4,5 | Most improve; progression slowed by about 6 to 12 months5,6 |
| Comfort care only | Pain relief, anti-inflammatory medicines and antibiotics4,13 | Improves comfort but usually doesn't extend survival much4 |
Surgery alone is not recommended for most nasal tumors, because complications are common and it doesn't improve control. Some specialists add surgery after radiation when tumor remains, but this isn't standard.5,14,6 A second course of radiation is sometimes possible if the tumor regrows.15 Chemotherapy has limited evidence, and most carcinomas carry a target (COX-2) for NSAID-class medicines, so vets may prescribe one.5,6 There is "no single 'right' choice."4 See dog cancer treatment for radiation basics and approximate costs.
Radiation Side Effects
- Short term: sore, red skin and mouth from about weeks 3 to 4, lasting a few weeks, often around the eyes. Your vet will give medicines and a cone, and soft, moist food helps.4
- Long term: skin or hair color changes, dry eye needing lifelong artificial tears, possible gradual vision loss in the treated eye, and mild ongoing discharge.4
- Serious problems such as non-healing wounds are uncommon, under 5% with full-course radiation. Openings between the nose and mouth or skin developed in about 7% after stereotactic radiation.4,9
Comfort Care
Effective pain control is essential and often combines an NSAID-class pain reliever with other pain medicines. Appetite support and a food your dog can manage help too.13,16 Watch for nosebleeds that get heavier, trouble breathing through the nose, not eating, or seizures.4,2 Talk to your vet when bad days start to outnumber good ones. See quality of life and when to say goodbye.
Frequently Asked Questions
What are the first signs of a nasal tumor in a dog?
A discharge or nosebleed that keeps coming back, often from one nostril, plus sneezing and noisy breathing.
Are nasal tumors painful for dogs?
They can cause facial pain as they grow, and radiation causes temporary soreness. Good pain control is part of treatment.
Is nasal cancer in dogs curable?
Rarely. Radiation controls it for about a year on average, but most tumors eventually regrow.
How long can a dog live with nasal cancer?
About 3 to 5 months without treatment, and about a year to a year and a half with full-course radiation.
What does a nasal tumor look like?
It usually isn't visible from outside. Late tumors can cause swelling over the nose, below the eye or on the roof of the mouth.
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Sources and further reading
This article was rewritten and fact-checked on October 29, 2026 against current veterinary references and specialist guidelines:
- Tonozzi CC. Neoplasia of the Respiratory System in Dogs and Cats. Merck Veterinary Manual (professional version), full review February 2022, updated September 2024.
- Llera R, Stoewen D, Pinard C. Nasal Tumors. VCA Animal Hospitals, updated January 2023.
- Kuehn NF. Cancers and Tumors of the Lung and Airway in Dogs. Merck Veterinary Manual (pet owner version), full review June 2018, updated September 2024.
- Clinical Oncology Service, Penn Vet Ryan Hospital. Nasal tumors. University of Pennsylvania, undated (file dated 2012; accessed October 2026).
- Iowa State University Lloyd Veterinary Medical Center, Oncology. Canine nasal carcinoma. Client flyer, undated (accessed October 2026).
- dvm360. Nasal tumors in dogs and cats (proceedings). dvm360, 2011.
- Lobetti RG. A retrospective study of chronic nasal disease in 75 dogs. Journal of the South African Veterinary Association 80(4):224-228, 2009.
- (Authors not shown on fetched page.) Evaluation of factors associated with survival in dogs with untreated nasal carcinomas: 139 cases (1993-2003). Journal of the American Veterinary Medical Association 2006;229(3):401-406.
- Yoshikawa H, Lafferty MH, Griffin LR, LaRue SM. A retrospective study of sinonasal tumors in 182 dogs treated with stereotactic radiotherapy (2010-2015). Journal of Veterinary Internal Medicine 2023;37(6):2356-2367.
- Mizuno R, Mori T. Prognostic factors and survival following radiation therapy for canine nasal tumors: a single-institution retrospective study of 166 cases. Open Veterinary Journal 2024;14(7):1538-1552.
- Mason SL, Maddox TW, Lillis SM, Blackwood L. Late presentation of canine nasal tumours in a UK referral hospital and treatment outcomes. Journal of Small Animal Practice 2013;54(7):347.
- Kuo K, Sepúlveda Bravo V. Epistaxis in Dogs: Diagnosis & Management. Clinician's Brief, June 26, 2026.
- McGivney C. Palliative care for nasal cancer patients. Veterinary Practice News, December 16, 2024.
- Boston S. Treatment options for nasal tumors affecting maxilla. ECVS Annual Scientific Meeting, Denmark, 2014 (hosted by IVIS).
- (Authors not shown on fetched page.) Reirradiation of Canine Nasal Carcinomas Treated with Coarsely Fractionated Radiation Protocols: 37 Cases. Journal of the American Animal Hospital Association 49(5):318-324, 2013. doi:10.5326/JAAHA-MS-5920.
- Murgia D. Managing oncology patients: hospice and palliative care. Vet Times, November 14, 2023.
About this article
Last updated : fully rewritten using the Merck Veterinary Manual, the University of Pennsylvania, Iowa State University, VCA, Clinician's Brief and studies published 2006 to 2024; added the research summary, signs, diagnosis, radiation options, side effects, comfort care, key takeaways and FAQ.
This page is for general information and is not a substitute for an exam by your veterinarian.
