Abu Dawud Book 1, Hadith Number 72.

Chapter : Performing ablution with water left over after a dog has drunk of it.

Narated By N/A : A similar tradition has been transmitted Abu Huriarah through a different chain of narrators. But this version has been narrated as a statement of Abu Hurairah himself and not attributed to the Prophet (PBUH). The version has the addition of the words: “If the cat licks (a utensil), it should be washed once.”