While black is one of the most common foundation colors for Dachshunds, a solid black Dachshund is the rarest Dachshund color in the world. This is due to the fact that a solid black coat is obtained when both parents have the same rare recessive gene. Dachshunds with black genes typically have tan point genes as well. While black is one of the most common foundation colors for Dachshunds, a solid black Dachshund is the rarest Dachshund color in the world. This is due to the fact that a solid black coat is obtained when both parents have the same rare recessive gene. Dachshunds with black genes typically have tan point genes as well.