Spleen Cancer in Dogs. In about three quarters of these cases, a ruptured spleen or liver mass is diagnosed as Hemangiosarcoma. Treatment involves removing the spleen, but even with treatment affected dogs rarely live more than a few months. Spleen tumors in dogs can be either benign or malignant, though both types of tumors are dangerous, because they could rupture at a moment's notice. Can Vet J 2016;57:842-846. Deadly spleen cancer in dogs. If the tumor hasn't ruptured, the dog's abdomen might appear distended and he appears lethargic. A ruptured spleen is typically caused by a blow to the left upper abdomen or the left lower chest, such as might happen during sporting mishaps, fistfights and car crashes. If they spread to other body parts, then long term prognosis is poor. Ruptured tumors can cause excessive bleeding in the abdomen and some cases, acute death can occur. The Chances of rupture of a malignant tumor are high due to the fragile nature of the spleen. At that point, the dog might go into shock, collapse and die. Symptoms of a Ruptured Spleen in Dogs Spleen ruptures in dogs may be spontaneous due to trauma from being hit by a car or from a penetrating wound. This tumor can occur from any site of the body that’s vascular but the most frequent locations in dogs are the spleen (40-50%), right atrium/heart (10-25%), and the skin (15%). This benign, slow growing tumor on dogs is cured by surgery. There are only limited treatment options. Hemangiosarcoma is an invasive and fast-growing cancer that affects a dog’s spleen, liver, and interior lining of the blood vessels. Lumps in the Spleen of Dogs Sometimes, dog owners don’t realize their pets have the cancer until they suddenly pass away without warning. Without treatment, dogs with lymphoid tumors have a life expectancy averaging ten weeks but a few live for six to twelve months. Life Expectancy of Dogs with Spleen Cancer. Ruptured spleen tumors typically cause severe bleeding and rapid death, due to blood-filled nature of the spleen itself. The spleen can usually be removed with almost no problems; however, life– threatening. A spleen can rupture due to: Injury to the left side of the body. Unfortunately, spleen cancer in dogs has a very poor prognosis, with many dogs only being able to live for a few months after being diagnosed. If the splenic tumor has not ruptured then surgical removal of the spleen is needed in most cases to determine whether the tumor is benign or malignant. These tumors are at risk for rupture and leakage of blood into the abdomen. Dogs with benign tumors have a very good prognosis. If a tumor is found on the spleen but is not yet bleeding into the abdomen, the chance of the tumor being cancerous is about 50/50. Hemangiosarcoma of the spleen is the most common cancer of the spleen in dogs. 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