First off there are two distinct yellows that have different "genotypes" which means genetic combinations for color. If a yellow Lab has one or two genes that encodes for black then the dog will have black pigment and this pigment can vary in intensity which I will discuss below. If a yellow Lab has two genes that encode for chocolate then the dog will have liver (chocolate) pigment also known as a "Dudley" and this can vary from very light flesh colored on a light yellow to a dark brown on a red or dark yellow. These different combinations can arise from various breedings depending on what color the parents are AND what colors they carry. Two blacks bred together for example can produce both black pigmented yellows AND liver pigmented yellows. Here are examples. This first dog is a dark yellow with black pigment. Notice the black around his muzzle and eyerims. His nose has faded to pink due to age. This inevitably happens to most yellows. It is often called
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