سُنَنُ ابْنِ مَاجَهْ
Sunan Ibn Majah 366
The Book of Purification and its Sunnah
Washing a vessel that has been licked by a dog
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا ابْنُ أَبِي مَرْيَمَ، أَنْبَأَنَا عَبْدُ اللَّهِ بْنُ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ إِذَا وَلَغَ الْكَلْبُ فِي إِنَاءِ أَحَدِكُمْ فَلْيَغْسِلْهُ سَبْعَ مَرَّاتٍ .
It was narrated that Ibn 'Umar said: "The Messenger of Allah said: 'If a dog licks the vessel of anyone of you, let him wash it seven times.'"
Sunan Ibn Majah, 366Hasan (Darussalam)