W. Dunbar Gram, DVM, DACVD, MRCVS, is Service Chief and Clinical Associate Professor of Dermatology at the University of Florida College of Veterinary Medicine in Gainesville, Florida, USA. Rowan J. Milner, BVSc (Hons), MMedVet (Med), PhD, DECVIM-CA, DACVIM, is Professor and Chair of the Department of Small Animal Clinical Sciences at the University of Florida College of Veterinary Medicine in Gainesville, Florida, USA. Remo Lobetti, BVSc (Hons), MMedVet (Med), PhD, DECVIM-CA, is an internist at Bryanston Veterinary Hospital in Johannesburg, South Africa.