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Hello, this is Dr. Jess. I am so very sorry to hear about Buddy. Unfortunately, this is a scenario that happens more often than we would like in veterinary medicine. The most common type of cancer found on the spleen is one called hemangiosarcoma. Oftentimes, a dog may be acting normally and an owner may have no idea that the pet is ill until either the tumor gets very large, or more likely, starts bleeding. In some cases the bleeding can become excessive and in many of the cases with this type of cancer, we can have metastases, or spread of the cancer to other organs.
Here is an article that talks in depth about splenic masses FYI: http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=1394