These are my personal favorites. There are many tricolor variations: black and tan, chocolate and tan, blue and tan, lilac and tan, and merle and tans. What gives these dogs their tan point markings is the allele combination at the A locus. The “At” gene is the main component in giving the dog its tri-color appearance. As mentioned before, the A gene is dominant over the “T” gene. So if a dog is (at/at) or (at/a) at the A-locus, the dog will express its Tan Points. Apart from the dog's tan points, what gives your dog its coat color is what alleles your dog carries at the D-, B-, and M-loci. The coat of a tricolor dog that doesn’t carry 2 alleles of blue or chocolate as a base color is solid black.
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