father Muhammad ibn al-Hasan, from al-Husayn ibn al-Hasan ibn Aban, from al-Husayn ibn Sa'id, from Hammad, from Hariz, from Muhammad ibn Muslim, from Abu Abdullah عليه السلام, who said: I asked Imam عليه السلام about a dog drinking from a vessel. Imam عليه السلام said: "Wash the vessel." And when asked about a cat, Imam عليه السلام said: "There is no harm in performing Wudu' (ablution) with its leftover water. It is considered amongst the wild animals."