What "raw" were you feeding? Some dogs won't eat slimy chicken, some hate the smell of liver, etc.
If there is a kibble he likes, try mixing in some small ground beef chunks with his kibble, so he can't separate them out, and gradually reduce the proportion of kibble to beef, and gradually mix in other raw. Watch out for allergic reactions and back up if you see any.
Liesl, b. 1/1/11