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S+ can show when it's het. It just tends to increase dapple expression or show up as brown splotches with dp I think. Here's my two het dp het S+ foals:


2SLV Black Meteor


3S A Pretty Tempo

And here are my nondp het S+ horses:


3S A Pretty Chance


2S A Pretty Plus ((he has roan as well))

From what I have found, there is no significant difference between S+Ssty and S+S+ horses, at least not when mixing it with dp is concerned.

S+ is a GMT only gene which works similarly to regular sooty (darkens the coat) but also gives a special dappled/mottled look to the coat. It may also make certain colors a bit different than regular sooty--it adds a golden sheen to buckskin wild bays, makes browns have a redder belly, makes liver chestnuts an interesting shade of actual livery red and turns chocolate palominos an amazing deep gold.

It's hard to see the effects on your colt because he's already quite patterned with his Kit M.

This colt is Sooty+ chocolate palomino. You can see how pronounced his dapples are and how he's a different shade from most regular chocolate palominos.


Day of the Moon ExP DPKPY

And this guy is Sooty+ black chestnut (homozygous DP). He's almost bay in coloration as you can see.


Blue Berry dDPKPeYsT