1. From the Wisconsin Veterinary Diagnostic Laboratory (Bell), University of Wisconsin-Madison, 445 Easterday Lane, Madison, WI, 53706, UW Veterinary Care (Soukup), and the Center for Comparative Oral and Maxillofacial Pathology (Bell, Soukup) School of Veterinary Medicine, University of Wisconsin-Madison, 2015 Linden Drive, Madison, WI, 53706