What is hemangiosarcoma?
Hemangiosarcoma is an aggressive cancer that starts in the blood vessels, most often in the spleen. It often shows few signs until a tumor bleeds, so many dogs are diagnosed suddenly, sometimes in an emergency.
Treatment usually starts with surgery to remove the spleen, followed by chemotherapy. Even with both, the cancer often comes back, and there is still no FDA-approved treatment for hemangiosarcoma in dogs.


