When they take their dog, Watch, for obedience training, the Alden children discover that some of the dogs in the class have vanished and decide to try to solve the mystery of their disappearance.

"A picture book biography of Dr. William Key, a former slave and self-trained veterinarian who taught his horse, Jim, to read and write and who together with Jim became one of the most famous traveling performance acts around the turn of the twentieth century. Includes afterword and author's sources"--