Michael W. Fox, BVet Med, PhD, DSc, MRCVS, writes a syndicated newspaper column and is the author of several books related to agriculture, food, health, and pets, including The Healing Touch for Cats and The Healing Touch for Dogs. He lives in Golden Valley, Minnesota. Elizabeth Hodgkins, DVM, is author of You and Your Cat: Simple New Secrets for a Longer, Stronger Life. She is a veterinarian in private practice and is a former director of technical affairs at Hill’s Pet Nutrition. She lives in Yorba Linda, California. Marion E. Smart, DVM, PhD, is an instructor of pathology, clinical pathology, and clinical nutrition at the Western College of Veterinary Medicine in Saskatoon, Saskatchewan, and at Ontario Veterinary College at the University of Guelph. She lives in Saskatoon, Saskatchewan.