Their stomachs are naturally acidic to break down raw meats and bones and kill any bacteria.
Make sure it is UNCOOKED bone though. Just wanted that to be clear. Never give a dog any meat that contains bones that have been cooked. The bones can splinter into shards and pierce the dogs stomach and intestines, resulting in thousands of $$$ in surgery and/or potential death. I know we're discussing a RAW diet, which would mean uncooked, but I can't assume that everyone who reads this thread will understand that.
My dogs have been exclusively raw fed for 4 years now and are thriving. When on kibble, they were on Orijen, Acana, Innova EVO, and Wellness CORE, all of which are grain-free and higher protein content. On raw, they can be fed all sorts of frozen and thawed meat and uncooked bones, etc. And yes, like someone else said, they only need a little bit of organ meat and liver each day, and liver IS very rich and can cause runny stool, unless it is balanced out with meat with higher bone content, as the digested bone is what helps solidify their stool.
Hope that helps! Let us know if you have any other questions. Good luck!