Musnad Ahmad 5:71

Yahya narrated to us, from Shu'bah, Ali ibn Mudrik narrated to me, from Abu Zur'ah, from Ibn Naji, from his father, from Ali, from the Prophet, peace and blessings of Allah be upon him: "The angels do not enter a house in which there is a person in a state of major ritual impurity (junub), nor an image, nor a dog."