The Horse and the Reindeer

A horse had an entire pasture to itself. One day, when it had gone outside, a reindeer entered the field, jumped about in every direction, and ruined the grass. When the horse returned and saw the destruction, it was furious and wished to teach the reindeer a lesson. 

"Will you help me in punishing that wild reindeer?" requested the horse to a man.

"Certainly!" the man replied. "But tell me, will you let me ride you on your back? Then I will help you and punish the reindeer with my weapon." 

"Yes, yes. Why not? I'm ready," said the horse. 

Since then, the horse has served man to take revenge on the reindeer.