Like their human friends, dogs come in all shapes, sizes, and colors. Some are smart, like Ma-Buku, a five-pound Chihuahua who squeaks her toy in perfect time with her owners drums. Some refuse to adhere to dog clich?s, like four-year-old Elmer, who loves to chase a tennis ball but refuses to pick it up and bring it back, or six-year-old Barnabas, who can't be bothered to chase cats but will bark vehemently at the wind. There are pretty dogs, heroic...