A royal castle was under siege from an infidel army. The only hope was to send one of the knights to get help, but the problem was that all of the horses had been killed in the battle.
"We must get help," said the king.
"I know," replied the leader of his army, "but we have no horses. If a knight goes on foot, he will be slain at once."
"Is there not another animal he can ride?" demanded the king.
"What about that mighty wolfhound? It could surely bear the weight of a man."
"No, no," pleaded the army leader. "The wolfhound is too dangerous. Look at its snarling teeth. I wouldn't send a knight out on a dog like this."