The traditional color, produced when one or both genes have the dominant
allele, is commonly referred to as black or black and rust (also called black and tan), while the
most common variation, due to both genes having the
recessive allele, produces what is called a red or red and rust Doberman in America and a «brown» Doberman in the rest of the world, which is primarily deep reddish - brown with rust markings.
Normally, capital letters are used to represent the
most dominant of each series, and the subcase letters under them refer to progressively less - dominant (
recessive) forms or
alleles of each type of gene.