In a land of intelligent, talking animals what do the predators eat? In more than one of the Oz books, Baum, the author, suggests that they eat each other. But he only suggests, vaguely implies, it. None of the main character predators: the Hungry Tiger, the Cowardly Lion, Toto the dog or Eureka the pink kitten, are ever show actually eating. A few bad animals, dragons, Kalidahs, the Skoodlers and other BAD folks threaten to eat our heroes but they never succeed.
In Gregory Macguire’s Wicked Years series there are both animals (the dumb sorts we’re used to) and Animals (who can think and talk). Animals eat animals.
In Skipp and Levinthal’s The Emerald Burrito of Oz there’s a brainless animal called a goomer that serves as the food source for all Oz predators.
I’m not sure what the predators eat in Steve Ahlquist’s version of Oz.