Gosh, she is pretty! My girl is similar, but she has the touches of tan on a mostly grey and white body. My mahogany sable Collie boy has a touch of merle also, which only shows in the grey tinge in the fur on his flanks. As I understand, that is why merles should only be bred to tricolors. That sneaky merle gene can hide behind the sable, and you may wind up with double merle puppies.