Q. My 15 year old Dashound has a large tumor on her liver. She just started drinking alot more water, and deceased appetite.
DAVID ELBEZE, DVM, MRCVS
A. These are not good signs, she might be starting getting into liver failure which is usually the end stage of liver malignant tumors.
Unfortunately at this stage there is very little you can do to help her, keep her comfortable until she stops eating, then you will have to consider euthanasia unfortunately.
There are some medication to support liver function and stimulate appetite, you can ask your vet about these although at this point I am not sure they will do any difference.