Horses are herbivores, meaning that they eat plant matter, with that being said hay and grass makes up most if not all of a horses’ diet. Therefore hay quality is extremely important. Hay that has gotten wet, it molded, dusty, or poor quality is not going to provide the nutritional requirements that a horse needs. Also keep in mind that horses were not designed to eat grains or feed. Therefore horses need to eat much more hay than grain. Especially horses kept in stalls, horses stomachs are small and designed to graze all day not just once in the morning and once at night. Also there are different types of hay that provide different nutritional benefits. Contact your veterinarian for what hay would be the best choice for your horse’s workload as well as the area that you are in.