William Oldenhoff, DVM, DACVD, is the staff dermatologist at Leader Animal Specialty Hospital in Cooper City, Florida. His clinical interests include recurrent pyoderma, Malassezia spp dermatitis, and allergy. Dr. Oldenhoff has lectured regionally and internationally, has published numerous peer-reviewed articles, and has contributed to several book chapters. He earned his DVM from University of Wisconsin–Madison and, after 2 years in small animal general practice, returned to the university to complete a dermatology internship and residency.