Kari Neumeyer feeds her dogs, Leo and Mia, a raw food diet supplemented by kibble, which she says is more natural than commercial dog food. Rob Eis/Courtesy of Kari Neumeyer hide caption

itoggle caption Rob Eis/Courtesy of Kari Neumeyer

Got spaghetti? Dogs digest starch more efficiently than their wolf ancestors, which may have been an important step during dog domestication. Lauren Solomon/iStockphoto.com/Nicholas Moore /Courtesy of Nature hide caption

itoggle caption Lauren Solomon/iStockphoto.com/Nicholas Moore /Courtesy of Nature