By
Stephen Reed, DVM, Dip ACVIM, Associate, Rood & Riddle Equine Hospital, Lexington, KY
Warwick Bayly, BVSc, MS, PhD, Dip ACVIM, Provost and Executive Vice President, Washington State University, Pullman, WA
Debra Sellon, DVM, PhD, Dip ACVIM, Professor, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA