The Horse and His Boy

The book that I read was The Horse and His Boy, by C.S. Lewis, has 203 pages, and is about a horse named Bree and a boy named Shasta who turns out to be Prince Cor.  They are traveling to Narnia from Calormen, and meet another pair of travelers whose names are Hwin, which is the horse, and Aravis, who was the rider.  They eventually get to Narnia and meet Aslan.