when my RB angel dog, duke, came home to me, he did an overnight switch. i had planned on slowly changing him, after all, he was 10, but he was MUCH more interested in the eaw food alex was eating, so i fixed him a bowl and that was it, he was raw fed. alex gets veggie mash (food processed veggies) and meats- ground beef heart, mackrel or chicken. he's been raw fed for 5 years now.