Game of Thrones is a site for the HBO-series based on George R.R. Martin's A Song of Ice and Fire.
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According to this cheeky post from David Benioff and Dan Weiss, it seems very likely that, “Woof woof” indicates that the role of Sandor Clegane, known as the Hound, has been filled. There’s currently no information on who has been cast in the role.