It was narrated from 'Abdullah bin Mughaffal that:
The Messenger of Allah said: 'If a dog licks a vessel, wash it seven times and rub it with dust the eight times." (RU)
English reference (RU): Vol. 1, Book 1, Hadith 365 (RU)
Arabic reference (RU): Book 1, Hadith 395 (RU)