Book excerpt: Horses run a close second to canines as man's best friend. Colorists fond of these high-spirited animals will be delighted with John Green's accurate, ready-to-color drawings of an impressive variety of equine breeds: Thoroughbred Andalusian; Arabian Percheron; Morgan Hanoverian; Mustang Cleveland Bay; Palomino Clydesdale; Appaloosa Missouri Fox Trotter; Pinto Lipizzaner; and Shetland Pony. Thirty black-and-white images of these prized animals, set against appropriate backgrounds, are accompanied by identifying captions.