I can't remember if it was three or four, but I do remember having a similar problem when I left the area after killing a few of them, couldn't find the remaining hound. You've already tried making the stew I gather, and of course your auto save before attacking the dogs is gone right? Other than re-loading before you attacked and checking in the far corners of the courtyard, importing it with shadow keeper, or just forgetting about it and try tackling a difficult but not unwinable battle (in my first game I didn't make the stew) there's not much to recommend.
Best of luck
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