Do I have to put my dog down?

I have an eleven year old Rhodesian Ridgeback. He has kidney failure, a large (possibly cancerous) outer abdominal tumor, and ulcerations in his intestines. My husband is giving him an herbal concoction daily that is supposed to help his kidneys mixed in with baking soda, which is supposed to help his ulcer. He has BARELY eaten for the last week. He has lost almost 20 pounds and is lethargic. Although he loves to go on walks and go to the park, he doesn't have a fraction of the energy that he used to have. My husband is very upset and is trying everything to help our dog. He doesn't want to put him down, but his quality of life is dwindling. What should we do? Help!

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