Hi, check him for internal worms. My girl is also on raw diet and sometimes she just doesn’t eat her food for few days. But she would eat a bone with meat around it always or boiled poultry. So, when these “mood days” are happening now, I just switch for a few days to different food.
Also, take away snacks these days, they know if the don’t eat their meal, they would fill up with snacks)))) usually, when they are sick, they would not eat anything at all but with internal worms they might eat junk but not meat. Good luck!