Karen B. London, PhD, is a Certified Applied Animal Behaviorist and Certified Pet Dog Trainer whose clinical work over the last 12 years has focused on the evaluation and treatment of serious behavioral problems in dogs. Karen writes the training column for The Bark and blogs at Dogbehaviorblog.com. She is an adjunct professor in the Department of Biological Sciences at Northern Arizona University, teaching a tropical field biology course in Nicaragua. Karen writes an animal column, “The London Zoo,” and is coordinating editor for the “High Country Running” column, both of which appear in The Arizona Daily Sun. She is the author of five books on canine training and behavior, including her most recent, Love Has No Age Limit: Welcoming An Adopted Dog Into Your Home.