The reason we vaccinate our horses is simple: We want to minimize their risk of contracting a life-threatening and/or infectious disease. With that said, the American Association of Equine Practitioners (AAEP) has designated certain vaccines as “core vaccines” all horses should receive annually, regardless of age, use, or location. Use this AAEP Vaccination Guidelines-based “cheat sheet” and work with your vet to devise an immunization program that’s right for your horse.