"If a dog drinks from the vessel of one of you, let him wash it seven times."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا شَرِبَ الْكَلْبُ فِي إِنَاءِ أَحَدِكُمْ فَلْيَغْسِلْهُ سَبْعَ مَرَّاتٍ  

"The Messenger of Allah ﷺ said: 'If a dog licks the vessel of any one of you, let him wash it seven times.'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا وَلَغَ الْكَلْبُ فِي إِنَاءِ أَحَدِكُمْ فَلْيَغْسِلْهُ سَبْعَ مَرَّاتٍ  

A similar Hadith was narrated from Abu Hurairah from Prophet ﷺ.  

عَنِ النَّبِيِّ ﷺ مِثْلَهُ