You have to have a variety of proteins. fish, poultry, beef, pork, deer, squirrel, rabbit
The bones needs to be edible. Small bones. Any from squirrel or rabbit. Chicken/duck/turkey necks. Any bone from the chicken or duck if they are butchered young. Avoid turkey legs. They are to tough to digest.
Variety of organ meats - liver, kidney, spleen, pancreas