"Skin pigment" refers to the color of our skin, which is determined by a substance called melanin. Different amounts of melanin produce various shades of skin color. Full definition
This coloring can be different from dog to dog, especially with dogs with different skin pigments on different parts of their body. (thehappypuppysite.com)
In many cases, a dog's coat and skin pigment provide sufficient sun protection. (petpoisonhelpline.com)
However, Elias and colleagues concluded in their study that changes in the skin's function as a barrier to the elements made a greater contribution than alterations in skin pigment in the ability of Northern Europeans to make vitamin D. (sciencedaily.com)