Are you confident your horses get sufficient nourishment from the hay you feed them? Horses eat up to 2.5 percent of their body weight in dry matter daily. That means that, on average, a 900-pound horse needs at least 18 pounds of hay every day. That’s why ensuring your horse eats the best feed is essential. There are two main types of hay feed: legume hay and grass hay. Here’s what you need to know to keep your horses fully nourished.