Worms are parasites that compromise your horse’s health. Various types of worms attack the many systems of your horse’s body, causing damage to the mouth, stomach, intestines, lungs, blood and skin, and compromising the horse’s immune system. At best, a high parasite load can degrade the overall look of your horse by manifesting in a dull coat or poor physique. At worst, parasites and their detrimental effects on your horse’s organs can cause colic or death. You can help keep your horse healthy by controlling his parasite load with a targeted deworming program involving fecal egg count analyses and consultation with your horse’s veterinarian.