A moist, tail-wagging gallimaufry of doggie data--jokes, saying, helpful care and feeding advice, first aid procedures, anecdotes, etc.--which mutt owners will welcome to their laps. There's Robert Benchley (""The ideal age for a boy to own a dog is between forty-five and fifty""), Mark Twain (""If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man""), even a dog therapy session with ""Dr. Joyce Mothers"" and the mixed breed aptitude test (the MBAT). Also, a recipe for Mutt Loaf, canine astrology characterizations, and a reference to Lassie the transvestite. What do you get if you cross a golden retriever and an Old English sheepdog? A golden oldie. A Malamute and a pointer? A moot point. Remember all those cat books that rang cash registers last year? Mutt is wearing the same kind of tags.