AggressiveDogs.
Jesse Gardner, Flickr Meet Mary Burch, American Kennel Club Canine Good Citizen Director and Paw Nation's expert columnist addressing your questions on animal behavior. Dr. Burch has over 25 years of experience working with dogs, and she is one of fewer than 50 Certified Applied Animal Behaviorists based in the United States. She is the author of 10 books, including the new official book on the AKC Canine Good Citizen Program, "Citizen Canine: 10 Essential Skills Every Well-Mannered Dog Should Know." I have a 6-year-old Lab named Charlie. I also have a new man in my life who has a 4-year-old mixed-breed dog (about Charlie's size) named Kathy. The problem is that Kathy and Charlie don't ...