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I agree with this. I have known dogs owned by other people who had chemo and radiation and none of them did well enough to make all the illness, discomfort and fear caused the by the treatment worth it to the dog. I don't think I would give radiation or chemo to my dog if it was older. I might consider it if it were a younger dog, but not from the condition you described your dog to be in - with bodywide metastisized mast cell cancer. He is probably in a lot of pain and should be humanely euthanized, while you hold him and tell him you love him.