Ah, spring: flowers, lush greenery…and misery for those who suffer from seasonal allergies. If you yourself aren’t plagued by itchy eyes, sneezing, or other symptoms of allergic rhinitis (“hay fever”), chances are you know someone who is. The range of human allergies is well-documented, and horse owners are beginning to discover that our equine friends can suffer from allergies, as well—and that uncontrolled symptoms can have detrimental effects on performance.