This deworming schedule provides for an effective parasite control program. Good pasture sanitation and rotation, along with composting and avoiding ground-level feeding can dramatically decrease exposure. It is no longer necessary to tube deworm horses. Paste dewormers are just as effective provided you are using the correct dose of the proper product and you are sure the horse swallows all of the medication. The brands listed below are generally preferred as the most effective. Rotation can be determined by what is less costly, but try to stay within the guidelines.