1. From the Department of Clinical Studies, University of Pennsylvania, Philadelphia, PA (J.R.); VCA Veterinary Referral Associates, Gaithersburg, MD (R.S.); School of Veterinary and Bio- medical Sciences, Murdoch University, Murdoch, Western Australia (D.R.); and Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida (D.R., J.C.).