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Color
Most people know the most common black color of a Doberman Pinscher. However, two different color genes exist in the Doberman, one for black (B) and one for color dilution (D), which provides for four different color phenotypes: black, red, blue, and fawn (Isabella).[3] The traditional and most common color occurs when both the color and dilution genes have at least one dominant allele (BB, Bb, or bB and DD, Dd, or dD), and is commonly referred to as black or black and rust (also called black and tan). The most common color variation occurs when the black gene has two recessive alleles (bb) but where the dilution gene has at least one dominant allele (DD, Dd, or dD), which produces what is called a red or red and rust Doberman Pinscher in America and a "brown" Doberman in the rest of the world, which is a deep reddish-brown with rust markings.
The remaining two colors, "blue" and "fawn", are controlled by the color dilution gene. In the case of the blue Doberman, the color gene has at least one dominant allele (BB, Bb, or bB), but the dilution gene has both recessive alleles (dd). The fawn (Isabella) is the least common color and occurs when both the color and dilution genes have two recessive alleles (bb and dd). Thus, the blue color is a diluted black, and the fawn color is a diluted red.
