Depends on the dog.
My wife and I rescued and re-homed 52 dogs over the last 7 years and we saw a great variety in acceptable diets. They were the most receptive and healthiest with home prepped food, a mix of 50% meat, 25% rice and 25% carrots. Each breed and mutt handled different meats well. Our rottie (until he was poisoned to death a month ago) did the best with lamb, not so well with ground beef and ok with occasional chicken. No oatmeal or eggs for that guy, big no-nos.
Good Luck!
Aw that's terrible, sorry to hear that! What happened to the poor rottie, if you don't mind my asking?