Shelties come in various colors... The description from the standard reads:
Black, blue merle, and sable (ranging from golden through mahogany); marked with varying amounts of white and/or tan. Faults-- Rustiness in a black or a blue coat. Washed-out or degenerate colors, such as pale sable and faded blue. Self-color in the case of blue merle, that is, without any merling or mottling and generally appearing as a faded or dilute tri-color. Conspicuous white body spots. Specimens with more than 50 percent white shall be so severely penalized as to effectively eliminate them from competition. Disqualification-- Brindle.