The Donkey Who Carried a King, R.C. Sproul, Reformation Trust Publishing.

Davey was a young donkey who never had anything to do...until ont day some strangers arrived and Davey was given a very special task: to carry the King into Jerusalem. Davey doesn't neccessarily understand everything that goes on but another donkey helps him see that the King is willingly a Servant on behalf of His people.