Canine Spinal Cancer: What Dog Owners Should Know

See a veterinarian today if your dog suddenly can't walk, is dragging its legs, has lost bladder or bowel control, or seems to be in severe neck or back pain. Spinal tumors can cause sudden worsening, for example when a weakened vertebra breaks (Meij, 2005), and fast care gives your dog the best chance.

Direct answer

Canine spinal cancer is a tumor in or around the spinal cord. Veterinarians group these tumors by where they sit. Extradural tumors grow outside the protective lining of the cord, usually in the bone of the vertebrae, and they make up about half of cases in dogs. Intradural-extramedullary tumors grow inside the lining but outside the cord, mainly meningiomas and nerve sheath tumors. Intramedullary tumors grow within the cord itself and are the least common (Meij, 2005).

The usual signs are neck or back pain and weakness or wobbliness that slowly gets worse. Because many of these tumors grow slowly, a large mass can build up before signs are obvious (Meij, 2005). MRI or CT is the preferred way to find them (Meij, 2005).

The outlook depends heavily on the tumor type. In one study, dogs with spinal meningiomas had a median survival of 508 days, compared with 187 days for nerve sheath tumors (Lacassagne et al., 2018). Malignant tumors of the vertebrae carry a more guarded outlook, with a median survival of 135 days in a study of 20 dogs (Dernell et al., 2000).

Key points

• About half of spinal tumors in dogs are extradural, usually tumors of the vertebral bone or cancer that has spread there (Meij, 2005).
• Common spinal tumors in dogs include osteosarcoma, fibrosarcoma, meningioma, nerve sheath tumors, and cancers that spread from elsewhere (Thomas, 2026).
• X-rays are often normal with spinal tumors, so MRI or CT is usually needed (Meij, 2005).
• Young dogs aren't exempt. Nephroblastoma, a spinal tumor of young dogs, appears between 5 and 36 months of age, most often in German Shepherd Dogs (Thomas, 2026).
• Meningiomas generally carry a better outlook than nerve sheath tumors (Lacassagne et al., 2018).
• How well a dog walks after surgery strongly predicts how long it lives with a vertebral tumor (Dernell et al., 2000).

Detailed explanation

Where spinal tumors grow

The spinal cord sits inside a canal made by the vertebrae and is wrapped in a tough lining called the dura. Where a tumor sits relative to that lining matters, because it shapes which tumor types are likely and whether surgery is possible (Meij, 2005).

Extradural tumors are the most common group in dogs, about 50% of cases. They include tumors of the vertebral bone, such as osteosarcoma, fibrosarcoma, chondrosarcoma, and multiple myeloma, as well as cancers that have spread to the spine, such as carcinomas, sarcomas, and melanoma (Meij, 2005). Osteosarcoma is the most common primary tumor of the vertebrae (Liptak, n.d.). Our pages on osteosarcoma and multiple myeloma cover those cancers elsewhere in the body.

Intradural-extramedullary tumors sit inside the dura but outside the cord. These are mainly meningiomas and nerve sheath tumors (Meij, 2005). In a study of 34 dogs with meningiomas, the tumors were most common in the neck region of the spinal cord (Petersen et al., 2008).

Intramedullary tumors grow within the cord and are the least common. They include gliomas (also seen among brain tumors in dogs), ependymomas, and cancers that have spread there, such as lymphoma (Meij, 2005). Our lymphoma in dogs hub explains that disease.

In a smaller study of 18 dogs and one cat, 47.4% of tumors were intradural-extramedullary, 42.1% extradural, and 10.5% intramedullary. Meningiomas and nerve sheath tumors were the most common types (Besalti et al., 2016).

Signs of spinal cancer in dogs

Signs usually start with vague discomfort and then progress to spinal pain and worsening nerve problems (Meij, 2005). You might notice:

• Neck or back pain
• Wobbliness, weakness, or scuffing of the paws
• Muscle wasting behind the affected area of the spine (Meij, 2005)
• Limping on one front leg, which can be an early sign of a nerve sheath tumor in the nerves of the shoulder area (Meij, 2005)
• Slowly worsening weakness in the back legs, the typical sign of nephroblastoma in young dogs (Thomas, 2026)

Nephroblastoma is a reminder that young dogs can get cancer too, and our article on cancer in German Shepherds covers that breed's other risks.

In the 19-animal study, signs worsened gradually in most cases (Besalti et al., 2016). Slow-growing tumors can stay hidden until they're large, especially in the neck (Meij, 2005). Dogs also tend to hide pain, so our article on signs your dog is hiding pain can help you spot it.

How spinal tumors are diagnosed

X-rays are often normal when a dog has a spinal tumor, though they can show bone tumors and help rule out infection of the spine. CT and MRI are the preferred tools because they show the cord directly and help plan surgery (Meij, 2005). Chest X-rays are recommended when a spinal tumor is suspected, to look for spread (Meij, 2005). Our article on whether your dog's cancer has spread explains what staging looks for. Why dogs need X-rays for cancer covers imaging more broadly.

Imaging can strongly suggest a tumor type, but it isn't perfect. A biopsy is needed for a definitive diagnosis of meningioma (Petersen et al., 2008), and features once thought typical of meningioma on MRI appeared in only 2 of 6 meningiomas in one study (Besalti et al., 2016). Our guide to reading a pathology report can help when results come back.

Treatment options

Surgery. Surgery is considered appropriate for extradural and intradural-extramedullary tumors. For tumors inside the cord, removal is usually palliative because the tumor's borders are unclear. Incomplete removal is common, so radiation or chemotherapy should be considered afterward (Meij, 2005). In the 19-animal study, nerve function didn't worsen after surgery except in one dog with a tumor inside the cord, and 4 of 5 dogs with meningiomas improved (Besalti et al., 2016).

Radiation. Radiation is used after surgery, for recurrence, or on its own. In dogs with spinal meningiomas, surgery effectively improved nerve function, and adding radiation may improve the outcome further (Petersen et al., 2008). In the 34-dog study of meningiomas and nerve sheath tumors, the seven dogs treated with stereotactic radiation, a highly focused form, gained an additional 125 to 346 days of survival (Lacassagne et al., 2018). In 9 dogs with vertebral osteosarcoma treated with stereotactic radiation, 5 of the 6 dogs whose pain could be assessed improved, and median survival was 139 days (Swift & LaRue, 2018). Our article on quality of life after radiation explains what to expect.

Chemotherapy. Chemotherapy should be considered for osteosarcoma and multiple myeloma of the spine (Liptak, n.d.).

Because spinal surgery and stereotactic radiation are specialized, asking about a referral to a veterinary oncologist or a veterinary neurologist is reasonable.

Outlook by tumor type

In general, the prognosis for spinal tumors in animals is poor (Thomas, 2026), but there's real variation:

• Meningioma: median survival of 508 days (Lacassagne et al., 2018). Surgery plus radiation carried a fair to excellent prognosis in another study (Petersen et al., 2008).
• Nerve sheath tumors: median survival of 187 days in one study (Lacassagne et al., 2018) and 180 days in another (Levy et al., 1997).
• Malignant vertebral tumors: in 20 dogs with vertebral osteosarcoma or fibrosarcoma, median survival was 135 days, ranging from 15 to 600 days. Most dogs died because the tumor came back at the spine (Dernell et al., 2000).
• Benign versus malignant: in 37 dogs with spinal tumors, median survival was 1,410 days for benign tumors and 180 days for malignant ones, though that difference didn't reach statistical significance (Levy et al., 1997).

For vertebral tumors, the dog's neurologic status after surgery was the only factor that significantly affected outcome (Dernell et al., 2000). Dogs with only pain before treatment had a median survival of 330 days, compared with 120 days for dogs with nerve deficits (Liptak, n.d.). That's another reason not to wait on neck or back pain that isn't improving.

If your dog has been diagnosed with a spinal tumor, our resources on pain management for dogs with cancer and tracking your dog's quality of life can help with day-to-day decisions.

When to contact a veterinarian

See a veterinarian today, or go to an emergency hospital, if your dog:

• Suddenly can't walk or stand, or is dragging one or more legs
• Has lost bladder or bowel control
• Cries out, trembles, or refuses to move because of neck or back pain

Book an appointment soon if your dog has:

• Neck or back pain that hasn't improved within a few days
• Wobbliness, weakness, or paw scuffing that's getting worse
• A limp on one front leg that keeps coming back
• Muscle loss over the back or hind legs

Questions to ask your veterinarian

• Could this be a spinal tumor, and does my dog need an MRI or CT?
• Should we take chest X-rays to check for spread?
• Where is the tumor: in the bone, the cord's lining, or the cord itself?
• Is surgery possible, and what's the chance my dog walks better afterward?
• Would radiation, including stereotactic radiation, help?
• Should we see a veterinary neurologist or oncologist?
• How will we manage pain and mobility at home?

Sources

Besalti, O., Caliskan, M., Can, P., Vural, S. A., Algin, O., & Ahlat, O. (2016). Imaging and surgical outcomes of spinal tumors in 18 dogs and one cat. Journal of Veterinary Science, 17(2), 225-234. 

Dernell, W. S., Van Vechten, B. J., Straw, R. C., LaRue, S. M., Powers, B. E., & Withrow, S. J. (2000). Outcome following treatment of vertebral tumors in 20 dogs (1986-1995). Journal of the American Animal Hospital Association, 36(3), 245-251. 

Lacassagne, K., Hearon, K., Berg, J., Séguin, B., Hoyt, L., Byer, B., & Selmic, L. E. (2018). Canine spinal meningiomas and nerve sheath tumours in 34 dogs (2008-2016): Distribution and long-term outcome based upon histopathology and treatment modality. Veterinary and Comparative Oncology, 16(3), 344-351. 

Levy, M. S. [VERIFY: confirm first author and add remaining authors] (1997). Spinal tumors in 37 dogs: Clinical outcome and long-term survival (1987-1994). Journal of the American Animal Hospital Association, 33(4), 307-312. 

Liptak, J. M. (n.d.). Vertebral tumors. Animal Cancer Surgeon. Retrieved November 10, 2026, from https://animalcancersurgeon.com/bone-tumors-vertebral

Meij, B. (2005). Spinal cord and nerve sheath tumors: Diagnosis and surgery [Conference proceedings]. World Small Animal Veterinary Association World Congress. https://www.vin.com/doc/?id=3854286

Petersen, S. A. (2008). Canine intraspinal meningiomas: Imaging features, histopathologic classification, and long-term outcome in 34 dogs. Journal of Veterinary Internal Medicine, 22(4), 946-953. 

Swift, K. E., & LaRue, S. M. (2018). Outcome of 9 dogs treated with stereotactic radiation therapy for primary or metastatic vertebral osteosarcoma. Veterinary and Comparative Oncology, 16(1).

Thomas, W. B. (2026). Neoplasia of the spinal column and cord in animals. Merck Veterinary Manual, Professional Version. Retrieved November 10, 2026, from https://www.merckvetmanual.com/nervous-system/diseases-of-the-spinal-column-and-cord/neoplasia-of-the-spinal-column-and-cord-in-animals