How Often Should Pet Rabbits Be Fed? How Often Should Pet Rabbits Be Fed Grass Hay? How Often Should Pet Rabbits Be Fed Fresh Greens? How Often Should Pet Rabbits Be Given Fresh Water? At BackyardBunnyNews, we help people who want to raise rabbits and bunnies by collating information about the hare-raising experience. A healthy diet for your pet rabbit requires that you give it the right kinds of foods. Some of the best choices are grass hay, fresh greens, and treats. You should introduce new items to their diet in small amounts at a time and gradually phase out the less healthy ones. It is also important to provide fresh water and a variety of fresh vegetables.