Narrated AbuHurayrah:

The Messenger of Allah (S) said: Gabriel (S) came to me and said: I came to you last night and was prevented from entering simply because there were images at the door, for there was a decorated curtain with images on it in the house, and there was a dog in the house. So order the head of the image which is in the house to be cut off so that it resembles the form of a tree; order the curtain to be cut up and made into two cushions spread out on which people may tread; and order the dog to be turned out. 

The Messenger of Allah (S) then did so. The dog belonged to al-Hasan or al-Husayn and was under their couch. So he ordered it to be turned out.

Abu Dawud said: Al-Nadd means a thing on which clothes are placed like a couch.