If you mix legume hay with grass hay, the rabbit may only pick out the calorie-rich legume hay and thus overload himself with calories, so we do not recommend mixing grass and legume hay. There are now several online sources of grass hay so even if you live in an area where you cannot get grass hay, you should be able to order it online. A small amount of alfalfa hay used as a treat is fine but not used as the routine hay source for the house rabbit.
Grass hays are made from timothy, meadow, oat, rye, barley or Bermuda grasses. Grass hay availability varies greatly in different areas of the country and the world. You may only be able to obtain one variety where you live. However, if at all possible, try to feed mixed grass hay or provide two or more individual types. Contrary to some sources it is not necessary to only feed timothy hay and it is much preferable to feed a variety of grass hays if available.
Grass hays are rich in nutrients but provide the lower energy diet appropriate for a house rabbit. These are the healthiest hays to feed. If you have a choice, choose sun-dried hay that has retained more of its nutrients than commercially dried hay. Do not feed straw. Straw is devoid of most nutrients and although it is not harmful in small amounts, it will lead to serious nutritional deficiencies if it is a major part of the rabbit diet.
Sources for hay include veterinary clinics, horse barns, feed stores, pet stores, rabbit clubs and a growing number of online stores. A few online stores that carry grass hay include the Oxbow Company, Kaytee and Sweet Meadow.