The Messenger of Allah ﷺ said. And he narrated to us from Muamar, from Ayub, from Ibn Sirin, from Abu Hurairah, from the Prophet ﷺ, who said, "When a dog laps from a vessel, wash it seven times."
حدثنا عبد الرزاق حدثنا هشام بن حسان عن ابن سيرين
قال رسول الله ﷺ و قال حدثنا معمر عن أيوب عن ابن سيرين عن أبي هريرة عن النبي ﷺ قال إذا ولغ الكلب في الإناء فاغسله سبع مرات
Its isnad is sahih, and it is a repetition of 7341 and 7342, and it has already appeared as part of hadith 7440. Muslim also related it, 1:92, via Ismail bin Ibrahim, from Hisham bin Hassan, from Ibn Sirin, in similar wording, adding at the end, "the first of them with earth."