What is the story that the Prophet Muhammad (saw) narrated about the cow and the wolf?
 Narrated Abu Huraira:                     The Prophet said, "While a man was riding a cow, it turned towards him and said, 'I have not been created for this purpose (i.e. carrying), I have been created for sloughing." The Prophet added, "I, Abu Bakr and `Umar believe in the story." The Prophet went on, "A wolf caught a sheep, and when the shepherd chased it, the wolf said, 'Who will be its guard on the day of wild beasts, when there will be no shepherd for it except me?' "After narrating it, the Prophet said, "I, Abu Bakr and `Umar too believe it." Abu Salama (a sub-narrator) said, "Abu Bakr and `Umar were not present then."