The English Kennel Club describes three different colors: 'tricolor, blue merle, and sable (ranging from golden through mahogany), marked with varying amounts of white and/or tan.' Essentially, however, a blue merle dog is a genetically black dog, either black, white, and tan (tricolor). In the show ring, blue merles may have blue eyes; all other colors must have brown eyes. Bi-black – black and white. Bi-black is recessive. A bi-black Sheltie carries two bi-black genes; thus any dog with a bi-black parent is always bi-factored whatever its own coat color is.
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