Sayyiduna Abu Hurayrah (may Allah be pleased with him) says: The vessel is to be washed from a cat's putting its mouth into it, just as it is washed from a dog's putting its mouth into it.
Ibn Ufayr narrated it thus as mawquf (a saying of the Companion); it has also been narrated from Rawh bin al-Faraj, from Ibn Ufayr, as marfu', and that is worthless.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1174