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I'm assuming brown buckskin, not regular bay.

This is a silver brown buckskin splash with one sooty.

Here you are: CLICK

So I see she's been yummed so it's probably a moot point, but here are my ideas.

First of all, even though she carries At, her phenotype is a standard buckskin (so Aa, not Ata for example). The bays can get a little confusing. At is a weakly acting form of bay which produces brown. So a horse that is E? Ata or E? AtAt will be brown based. One thing that sometimes confuses people about brown is that a homozygous brown is lighter than a brown that is heterozygous. Think about it this way, any form of bay wants to push the black of a horse to the points (legs, mane, tail). At is a weak form, so it doesn't do a very good job. (A good example is your foal's dam.) With two copies of At, the brown pushes twice as hard and so you see more red on a horse and less black. http://hj2.huntandjump.com/horse.php?horseid=194952

Now, regular bay (A) is stronger that At, so if you have a horse that is AAt (like your foal), they will only display their A and they will look like a regular bay. Meanwhile, wild bay (A+) is the strongest of all, and will overpower the other two bays. So A+a, A+At, and A+A will all be wild bay.

Now DP basically functions like "bonus sooty". If you have a horse that is SstySsty and carries DP, they will appear darker than a standard SstySsty horse (if they are red or bay based). Being SstyS certainly does not exclude a horse from carrying DP, but that extra copy of DP will make the horse look like a SstySsty horse. Because your foal only looks like a SstyS horse to me, and that is in fact what she tested as, she is not DP. If you are ever wondering if your horse looks SstyS or SstySsty, you can use the search for "buckskin" and look for horses that match your horse. (I recommend only searching for younger (~5 or younger) horses because the colors change frequently and these are most likely to be updated.

Oh one last thing, a horse cannot become DP by breeding to another DP horse. Your horse either carries DP or not.

Im so very confused here pine posted it but dove yummed?

Oh ok

Sorry :\