Our canine friends have guided us, rescued us, led us, protected us and even given early warning of illness, but dogs are only part of the story. From the horses that went to war with the Light Brigade, to the mine-clearing Gambian Pouched Rat called Courage that helped make the peace, and from the pigeons carrying life-saving messages to the wild dolphin called Jock who befriended a traumatised young woman in Australia, in