I have 2 dogs thst I am currently treating with a liver mass. They have not been confirmed as benign or malignant, but that does not really matter to me. I am treating them both as Blood stasis, primarily, and use GXZYT with San Leng and E Zhu, similar to Dr. Marsden's mast cell tumor formula with a different base.
I also find that there are frequently signs of Damp Heat and Qi stagnation, for which I add Si Miao San (has berberine-antineoplastic), Long Dan Xie Gan Tang(moves Qi, clears Heat, cooling and a little nourishing). and sometimes just add a little Chai Hu if I want stronger Qi moving effects.
I always add antioxidant, silymarin, and some sort of medicinal mushroom, as well as reduced to no carbohydrate in the diet.
I find that many people that come to me have had no discussion of diet modifications bt their veterinarian.
Jodi