Feed your rabbit a healthy diet. A rabbit's diet should consist of grass, fresh vegetables, and timothy hay or oat hay. More specifically, a rabbit should have an unlimited supply of hay. You can also feed your rabbit store-bought pellets, however, pellets should be fed in small amounts. Make sure that you get your rabbit the right kind of pellets 

(youth pellets if the rabbit is under 6 months, adult if the rabbit is older than 6 months).

High-fiber pellets should be offered daily, but in small quantities to prevent health problems. Rabbits under four pounds can be given 1/4 cup of pellets. As a general rule, you can add another 1/4 cup of pellets daily for every additional two pounds of body weight on your rabbit.

Young rabbits can be given alfalfa hay, but alfalfa is not a healthy option for adults. It's recommended that you switch your rabbit to timothy hay before it reaches one year old.