I’m so sorry to hear about your buddy. Once my Dad was hospice, I made sure he had anything he wanted to eat. He had no medical dietary restrictions, so if he wanted to eat a pound of black jelly beans or a triple meat triple cheese whopper for dinner, he got it. It is OK to treat your dog that way as well.
However, as far as the raw diet goes and the suggestion that commercial dog foods are “bad” -— the very reason our pets are living long enough now to get cancer in their old age is at least in part the quality of nutrition provided by the commercial diets that have been available to them. NO, I am not a dog food company.
You might want to google some of the problems with commercial dog foods. I will never buy Purina again, for good reason. I will also point out that there is nothing much “natural” about dried pet foods. I think you'll find that like with us humans, medical care is the thing.
Though you make a good point about letting the pet (or person) eat whatever they want. When my mom was dying of ovarian cancer, I was her only caretaker for a couple of weeks. If I could get her what she wanted soon enough, she could eat it. If not, she couldn't. She had fought off the cancer twice, through diet in addition to the surgery and chemo. The third time she didn't feel like fighting it. We got in some good talking, and when she passed, I was relieved, but sad. Still miss her, too.
OS
WRM, MSgt, USAF(Ret.)