I'm not sure about a sequel for Deerskin. I love it as it is, and almost feel like any children would be a let-down.

At any rate, there's a semi-reference to them in either Rose Daughter or Spindle's End (which I've read, and enjoyed - despite my dislike of Sleeping Beauty), something about a kingdom to the north known for their long-haired fleethounds. I can't remember which one, or where in the storyline, or I'd look it up...