What Do Pet Rabbits Eat? At BackyardBunnyNews, we help people who want to raise rabbits and bunnies by collating information about the hare-raising experience. Food. They eat food. But unlike Bugs Bunny, they eat many things besides carrots. There are several types of rabbit food available in the market. The main one is grass hay. This type of food is rich in calcium and protein, so your rabbit will benefit from it. You can also add vegetables and fruits to your rabbit’s diet. Fruits should be given sparingly.