1. From the Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, 1008 W Hazelwood Dr, Urbana, IL 61801 (Goetz) Dr RJ Keeran PC, 57533 Pontiac Trail, New Hudson, MI 48165 (Keegan); Comparative Oncology Unit, College of Veterinary Medicine, Colorado State University, Fort Collins, CO 80523 (Ogilvie); and the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Mississippi State University, PO Box V, Mississippi State, MS 39762 (Johnson).