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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.
Other genes with dominant alleles are the agouti gene, which controls color expression along the length of each shaft of hair, and the eumelanin and dilute genes, which also influence coat color. Agouti. Some cats have hairs in which there is more than one color distributed along the hair shaft.