Narrated Abu Hurairah: The Prophet (sal Allaahu alayhi wa sallam) said: The purification of the utensil belonging to any one of you, after it has been licked by a dog, consists of washing it seven times, using sand in the first instance.Abu Dawud said : A similar tradition has been narrated by Abu Ayyub and Habib b. al-Shahid on the authority of Muhammad.