What should you feed your horses in Spain there is no grass?

If there is no grass you need to find hay (bales or cubes work best, but pellets will do in a pinch.) And/ or beet pulp. Alfalfa (also called lucern) will do. A horse needs long stem fiber for it's digestive system to work properly. If it does not recieve this type of fiber it can cause digestive upset and even colic.