Graviola dose

My springer spaniel Mollie has just been diagnosed with TCC and has 2 tumors in her bladder.  She had a spindle cell sarcoma 2 years ago and recently (7 weeks ago) had her spleen removed due to another tumor. She is still slightly ameamic from that procedure and I think it is just a matter of time now, as I suspect that the cancer has manage to invade other parts of her body and am unwilling to put her through any more invasive treatment. She is being treated with a muscle relaxant for the bladder problem in order to make her more comfortable and I have read that Graviola is helpful in sometimes reducing the growth of the tumors. Does anyone know how much to give a dog weighing 40lbs and in how much water? Also - should I take her for less walks so that she doesn't strain and bleed so much? Any advice would be great.  Thanks - Kay