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I apologize that no one has responded to your question sooner. Different experts come online at various times. I just came online and saw your question. My name is ***** ***** I’m a biologist with a special interest in canine cancer. I'm so sorry to hear of this diagnosis.A great deal depends on the nature of the tumor. Some additional information will be useful.
Has your vet told you what kind of tumor this is - hemangiosarcoma, liposarcoma, etc.?
Has a biopsy been done?
Have you seen an oncologist, or only your local vet?
I can give you information on the best ways to feed a dog with cancer, but will wait for this other information before proceeding. Thank you.