Musnad Ahmad 30:3063

Waki’ narrated to us, from Yunus ibn Abi Ishaq, from Mujahid, from Abu Hurairah, who said: "Gabriel came to the Prophet, peace and blessings of Allah be upon him, and said: 'I came to you last night, and nothing prevented me from entering upon you except a dog that was in the house, and a statue of a figure on a curtain that was on the door.'" He said: "So they looked, and behold, there was a puppy belonging to Al-Hasan or Al-Husayn under a piece of furniture of theirs." He ordered that the dog be taken out, and that the head of the figure be cut off so that it would become like a tree, and that the curtain be made into two cushions.