Why do horses lick salt blocks?

Just like us, horses need certain minerals to stay healthy. Most horses today are not kept in places where they could find these minerals on their own. So owners must provide salt for their horses just like they provide food and water. Salt should be kept out where the horse has free choice to eat whenever he wants to. There are several different types of salt lick (iodized or non-iodized) but to make sure you get exactly what your horse needs consult a vet.