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DP is a real-life, non-testable (in game) attribute of recessive Extension which controls red pigment. DP stands for dense pheomelanin and its presence increases the production of pheomelanin, darkening the red color of the coat. It produces liver chestnuts, and, when homozygous and in conjuction with sooty, "black" chestnuts, "black" palominos and buckskins. It is enhanced by heterozygous Ssty and even more by homozygous SstySsty.

Some examples:

SstySsty liver chestnut
http://www.huntandjump.com/horse.php?horseid=2875482

Non-sooty "Pumpkin" chestnut
http://www.huntandjump.com/horse.php?horseid=2959539

"black" chestnut
http://www.huntandjump.com/horse.php?horseid=3111911

Ssty liver chestnut
http://www.huntandjump.com/horse.php?horseid=3173581

It is extremely rare, both in real life and in the game. Ammit recently introduced it to the general gene set (not limited edition) and it's all the rage, along with the two additional variations to bay--At (brown), and A+ (wild bay).