Hi Pat,
My baby boy Chance was diagnosed on March 28th with a very large heart based tumor. He just turned 9 y/o last December. The tumor, at the time diagnosis, was the size of a baseball. The doctors suspect that the tumor is a Heart Based Hemangiosarcoma, a very bad, aggressive, tumor. Here is the the link I posted about it shortly after he was diagnosed;
http://www.boxerworld.com/forums/showthread.php?t=98199
We were also told us there was NOTHING we could do for him, just enjoy every minute we have with him because his time is VERY limited. I am beyond devastated, my heart physically aches and I cannot imagine living my life without him.
Since his diagnosis he has had a few more "episodes" but has managed to hang on for now. He is courrently on Sota

80mg 1/2 tablet twice daily; this is to help control the VPC's he has due to the tumor. A coworker of mine also told me about soomething called Artemisinin, it supposed to help people and animals with cancer. She had two bottles that were going to expire and did not need them so she gave them to me. I honestly believe that it is helping him and that is the reason he is still with us now. I actually just bought another bottle of it and I'm waiting for it to arrive. Is it really working??? Who knows!!! However, I will continue to use it. His doctor is very suprised that he is still hanging on esp because of the size of the tumor.
I am so SORRY you have to face this horrible diagnosis. I know too well the pain and devastation you are dealing with. I have been living the last 7 1/2 weeks in fear because I know the tumor can/will rupture at any given minute and I will lose him. I hope you have many more weeks to share with your baby, enjoy every minute with him. Again I am so sorry. If you need to talk or have any questions, please let me know.
((((HUGS))))