“Red maple has an oxidant that destroys hemoglobin—red blood cells,” says Anthony P. Knight, BVSc, MS, Dipl. ACVIM, professor emeritus at the Colorado State University College of Veterinary Medicine and Biomedical Sciences and author of A Guide to Plant Poisoning of Animals in North America. “Horses will present with weakness, jaundice, and anemia, and urine may turn dark brown as the body filters out the dead cells.”

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