spleen tumors in dogs causes
Sometimes the tumor within the spleen is not even the primary tumor, but rather a single nodule or multiple nodules due to metastasis from a distant primary tumor. Hematoma Hematomas are one of the most common causes of an enlarged spleen in dogs, representing over 50% of splenomegaly cases. This type of splenic mass is basically an accumulation of pooled blood within the splenic tissue; many stop growing and are then resorbed after a period of time, but others grow exponentially and eventually rupture.