Rex Dexter is itching to have a dog. He was practically born to have one. His name is Rex, for crying out loud. It's a dog's name. Any pooch is preferable, but a chocolate Labrador is the pinnacle. The best of the best. The dream of all dreams.When Rex's B-Day for Me-Day finally arrives, his parents surprise him with a box. A box with holes. A box with holes and adorable scratchy noises coming from inside. Could it be? Yes! It has to be! A . . . a . . . Chicken? Pet poultry?H