Canine nasal tumors are not very common – they account for about one percent of all tumors in dogs.
Several tumor types can be found in the dog’s nasal cavity, which is a large air-filled space above and behind the nose.
The most frequently occurring nasal tumor in dogs is squamous cell carcinoma, although fibrosarcoma and many others can also occur.
All of these tumors arise within the inside of the nose or the sinuses. Both carcinomas and sarcomas are locally invasive and can invade vital surrounding structures such as the throat.
Some tumors also metastasize (spread) to more distant areas of the body.
Up to 30% of nasal tumors in dogs will spread to the lungs, but this usually happens long after the tumor first forms.
These nasal tumors can also spread to the lymph nodes, the bones, the liver, the brain, and rarely to other areas of the body.
Older dogs (average age 10 years) are at higher risk of developing nasal cancer.
Causes of Nasal Cancer in Dogs
The exact cause of this canine cancer is not known. But it appears that certain breeds (e.g. the Collies) are more predisposed to nasal tumors than others.
Environmental airborne carcinogens (cancer-causing agents), such as cigarette smoke, fume from kerosene heaters, and car exhaust, are also risk factors that can increase the risk for nasal cancer in dogs.
Symptoms of Nasal Cancer in Dogs
Other signs include:
- Noisy breathing (snorting or snoring)
- Bad breath
- A visible swelling or facial deformity (due to tumor growth)
- Eye discharge (due to tumor obstruction of the ducts)
Diagnosis and Treatment of Nasal Cancer in Dogs
A vet usually perform a tissue biopsy to definitively confirm the type and malignancy of the tumor.
He also uses CT scan to evaluate the extent of tumors in the nasal cavity. He will also take chest x-rays to determine if the cancer has metastasized to the lungs.
Conventional treatment of choice for nasal tumors in dogs is radiation.
Radiation is not curative. The goal is to shrink the tumor in order to increase lifespan and keep a good life quality for the dog.
Radiation therapy is available only in select cities and veterinary schools. (The University of Wisconsin Veterinary School has the most precise radiation for nasal tumors.)
For radiation to be most effective and successful, it should be combined with CT scans which are capable of locating problem areas even at the back of the sinuses in the nasal cavity (areas usually overlooked by x-rays).
For most nasal tumors, radiation therapy by itself can increase survival by one year in about half of the dogs treated.
Some studies showed that one dog in four will live 2 years following radiation treatment.
Recently, there is a new treatment plan for nasal tumors in dogs which includes radiation therapy every weekday for 3 weeks, along with a chemotherapy drug, cisplatin.
The cisplatin is contained in a sponge-like material which is surgically implanted in the muscle. The sponge-like material slowly delivers the drug into the bloodstream and works on the tumor over the 3 weeks of radiation.
The approximate survival time using this treatment plan is 580 days.
If the tumor is located close to the front of the muzzle, surgery, either alone or in combination with radiation, may be possible to remove the tumor.
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