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You can't tell a horse is DP for sure from its genotype because it's a hidden gene.

When it's unknown whether a parent has DP, you can speculate that a horse you have might be carrying it when that horse seems much darker or much redder (depending on base color) than another horse with the same base color and SSty that is known to not have DP in their pedigree. However, there is a range of colors within each coat combination that can make it difficult to separate a particularly dark SSty S chestnut from a particularly light DP dp Ssty S chestnut.

I had quite a few DP DP stallions in my herd, so I always knew all of their direct offspring were at least DP dp...but then when you get to the gen 3s I could really struggle with some to figure out whether I thought they had inherited DP or not. Especially when you start getting into the agoutis or the diluting genes, it can get very complicated very quickly! But sometimes you would swear up and down a filly missed DP and the suddenly she will produce an obviously DP foal....it's fun!

Thank you guys so much!

@Ritsika Oh, thank you so much!