RedTan and White Explained
  Red Tan and White (ayBCDEgmrsi/spt) This color has the same formula as the Red Tan dog with the exception of carrying a different gene that produces varying amounts of white. If your dog is Red Tan and White the (S) gene would be replaced with one of these White producing gene patterns, (si, or sp) in any combination. 
 This color is dominant in nature in double dose to the colors Black and Tan, and Sable but recessive to Black. In order to produce a true Red Tan dog it must be bred to a dog of the same color or a Sable dog which carries the (ay) gene. It appears as a rich Reddish Tan color and can vary in shade from light to dark. It is uniform in color throughout the dogs coat and always has a black nose. This color is exactly the same in formula to a Tan dog but appears much redder in color as opposed to Tan. Breed specific genes and modifiers play a significant role in this color.
For more info see White Chart.
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