Horses generally avoid eating toxic plants, but some, such as wilted red maple leaves, certain ornamental shrubs and some weeds and wildflowers, are quite attractive, says veterinarian Anthony Knight, professor emeritus at Colorado State University. Dr. Knight and Rutgers University equine extension specialist Carey Williams recommend creating a buffer zone between pastures and neighboring properties, identifying and controlling toxic weeds, feeding horses a high-quality diet from a local supplier, avoiding black walnut in bedding and contacting a veterinarian immediately if horses show signs of toxicity.
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