There are different types of hay available on the market; when choosing the most suitable type you have to pay attention to the age of the bunny and its requirements. Hay is rich in fiber and it is one of the most important things to be included in the daily diet of rabbits. The most common types of grass hay for rabbits are Timothy Hay , orchard grass and oat hay. Hay should be fresh and of premium quality; also, it is best to avoid hay that contains dried corn, nuts and seeds.