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Coat color in Pugs has long been a source of controversy, and much of this discussion stems from a misinterpretation of the original breed standard.
The original Pug standard mentioned silver(-), apricot-fawn and black as the accepted colors. For some unknown reason the fact that a hyphen was missing after the term 'silver' lead to the interpretation that silver, apricot and fawn were meant
Eventually the two types became interbred and the distinction faded and silver-fawn pugs have become extremely rare today. However, it is still common to speak of a Willoughby Pug, a cold fawn color, or a Morrison Pug, a golden apricot shade and many characteristics seen in today's pugs can still be traced back to one of these two lines.