Reviewed and approved by: Dr. Robert Causey, Ph.D., D.V.M., Department of Animal and Veterinary Science, The University of Maine, Orono, Maine; Dr. Jeff Fay, Ph.D., D.V.M., Annabaessacook Veterinary Hospital, Monmouth, Maine, Board Member, Maine Equine Industry Association; Dr. Chip Ridky, D.V.M., Maine State Veterinarian, Augusta, Maine; James A. Weber, Ph.D., D.V.M., Department of Animal and