حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زَائِدَةُ، - فِي حَدِيثِ هِشَامٍ - عَنْ مُحَمَّدٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ طُهُورُ إِنَاءِ أَحَدِكُمْ إِذَا وَلَغَ فِيهِ الْكَلْبُ أَنْ يُغْسَلَ سَبْعَ مِرَارٍ أُولاَهُنَّ بِتُرَابٍ ‏"‏ ‏.‏ قَالَ أَبُو دَاوُدَ وَكَذَلِكَ قَالَ أَيُّوبُ وَحَبِيبُ بْنُ الشَّهِيدِ عَنْ مُحَمَّدٍ ‏.‏

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. Translation Not Available

Book Ref: Sunan Abi Dawud Book 1 Hadith 71
Web Ref:  Sunan Abi Dawud Book 1 Hadith 71