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. Dogs with benign tumors have a very good prognosis. There are only limited treatment options. A spleen can rupture due to: Injury to the left side of the body. Life Expectancy of Dogs with Spleen Cancer. At that point, the dog might go into shock, collapse and die. The life expectancy of course depends on whether the cancer has spread and if … 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. The Chances of rupture of a malignant tumor are high due to the fragile nature of the spleen. Spleen Cancer in Dogs. Tumors on the spleen can be benign or cancerous. This benign, slow growing tumor on dogs is cured by surgery. Can Vet J 2016;57:842-846. Survival with the intestinal form averages only eight weeks. Dogs that have stage I hemangiosarcoma, like these patients (non-ruptured) and have surgery, typically live at least twice as long as patients that are diagnosed after their tumor as ruptured. Read more about the spleen: Cancer in the Spleen of Dogs. These tumors are at risk for rupture and leakage of blood into the abdomen. 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%). Sometimes, dog owners don’t realize their pets have the cancer until they suddenly pass away without warning. Treatment involves removing the spleen, but even with treatment affected dogs rarely live more than a few months. If they spread to other body parts, then long term prognosis is poor. 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. Ruptured spleen tumors typically cause severe bleeding and rapid death, due to blood-filled nature of the spleen itself. Without treatment, dogs with lymphoid tumors have a life expectancy averaging ten weeks but a few live for six to twelve months. In about three quarters of these cases, a ruptured spleen or liver mass is diagnosed as Hemangiosarcoma. Your dog can live without his spleen, however. Unfortunately, a more rare diagnosis of Hemangioma is made by biopsy in less than 1/3 of these cases. 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. 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. 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