My understanding is that a modified coat is a combination of silk and soft. I believe wooly is maybe an older term used in conjunction with soft. As to wiry, to me, that would mean a coat more similar to a Welsh Terrier, or a kinky type. Soft, wooly and wiry coats are slower to grow, mat easier and more difficult to maintain in general. A true silk coat with maintenance does not mat, is straight (for the most part) and is not fuzzy (ideally). I'm sure there is something wrong with my description and anyone with more correct information is appreciated.
Yorkierose (Pat) or Lorraine can give a much better description I'm sure.
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