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Biochemistry of Dog Coat Color. The color of a dogâs coat is determined by relative levels of two pigments: eumelanin, which can be either brown or black, and pheomelanin, which is yellow to orange or red. Both pigments are generated by metabolism of tyrosine. A schematic diagram of the pathway is below. Schematic of the melanin synthesis pathways.
The a y  gene produces a coat color that can range from a light fawn to darker red to a sable. This variation of color is due to variance in expression of this gene. A dog (k y /k y for K Locus) that has one or two copies of the a y  allele will always express the a y  coat pattern.he most dominant allele is a y , followed by a w , then a t , then a.. While the Agouti gene (A Locus) does determine the base coat color in dogs that are k y /k y for Dominant Black, the color of the dog can still be modified by other genes, such as the B Locus or D Locus.