How many types of Yorkies are there?

Yorkshire Terriers come in over seven types, including Teacup (extra small), Mismarked (atypical color patterns), Designer (mixed breeds), Solid Black (uncommon), and Parti (tri-colored) Yorkies. The American Kennel Club , however, only recognizes one breed of Yorkshire Terrier. Biewer Terriers are a new official breed that recently emerged as a variation from the parti-colored Yorkie.