GRRRRRR! defines each type of aggressive canine behavior and examines its causes and potential for danger. Those looking for a puppy will find useful instructions on how to choose a new best friend for its temperament, as well as methods for training both puppies and older dogs. The authors also include invaluable information on confronting aggressive dogs. Written in the authors entertaining and accessible style, this new book from America's premier dog experts is perfect for everyone with a dog in their life.