Deadly spleen cancer in dogs. 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. Your dog can live without his spleen, however. 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. Sometimes, dog owners don’t realize their pets have the cancer until they suddenly pass away without warning. 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. In about three quarters of these cases, a ruptured spleen or liver mass is diagnosed as Hemangiosarcoma. 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. Treatment involves removing the spleen, but even with treatment affected dogs rarely live more than a few months. There are only limited treatment options. The Chances of rupture of a malignant tumor are high due to the fragile nature of the spleen. If they spread to other body parts, then long term prognosis is poor. If the tumor hasn't ruptured, the dog's abdomen might appear distended and he appears lethargic. Hemangiosarcoma of the spleen is the most common cancer of the spleen in dogs. A spleen can rupture due to: Injury to the left side of the body. The life expectancy of course depends on whether the cancer has spread and if … Without treatment, dogs with lymphoid tumors have a life expectancy averaging ten weeks but a few live for six to twelve months. Ruptured spleen tumors typically cause severe bleeding and rapid death, due to blood-filled nature of the spleen itself. Lumps in the Spleen of Dogs Can Vet J 2016;57:842-846. 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. Spleen Cancer in Dogs. Ruptured tumors can cause excessive bleeding in the abdomen and some cases, acute death can occur. It may also be a very slow process were the owner notices symptoms of spleen rupture in dogs under the form of lethargy, inappetence, weakness and an abdomen that appears to be distended . Hemangiosarcoma is an invasive and fast-growing cancer that affects a dog’s spleen, liver, and interior lining of the blood vessels. Read more about the spleen: Cancer in the Spleen of Dogs. At that point, the dog might go into shock, collapse and die. Unfortunately, a more rare diagnosis of Hemangioma is made by biopsy in less than 1/3 of these cases. This benign, slow growing tumor on dogs is cured by surgery. Survival with the intestinal form averages only eight weeks. 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