I do it with all of my game animals. All scraps, grind the bone to a powder, add your fat. Give it to them raw.... you tube has some great recipes for raw diets
I thought about doing that with road questionable kill deer when I was considering a dog. It would be cheaper and better for the dog but would take quite a bit extra work.
The girlfriend and I are planning to do this for our dogs, did a bunch of research on the matter and decided that this is something we wanted to do. Lots of recipe books out there, this is the one I wanted, but it's out of print and expensive.
my uncle would take all his scraps and freeze them together. He called it a meatsicle for his dogs. the dogs would lay around in the summer and lick the meatsicle.
Dog nutrition is a little more than just 100% meat. I would recommend asking your vet to assist. There was a book called "Clinical Nutrition of the Dog and Cat" that had a lot of food requirements at every growth stage and some recipes to make those diets.
Remember that the coyotes and wolves eat the entire carcass (liver, marrow, etc). So a 100% meat diet doesn't meet nutritional requirements.
Grab road kill... throw in truck... drive home... unload. dogs do not need to cross fence to chomp on roadkill /trainkill getting hit by same. Results in gassy but live dogs, legality... somewhat questionable, use the "I feared for their lives" defense.