Black is known as a self-color, that is the entire animal is one color, with extreme black pigmentation of the coat. In poms it is usually caused by the dominant K allele, although there are some reported cases of recessive black (a) in the breed.
Black Newborns 
Black 10 wks 
Black 6 mos 
Black Adult 
Black Adult
Other Self-Colors
The presence of other recessives can turn the solid black dog to other variations, such as solid chocolate (bb) and blue (dd) and, when both are on the same dog, isabella/lavender (bbdd). In addition, the presence of two recessive clear orange (ee) genes can result in a clear orange dog that can disguise the presence of the black K gene completely.
Chocolate 
Blue 
Dilute Chocolate (Isabella aka Lavender)
