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Oh yes, definitely! I always take absolutely no chances of a lethal foal, no matter how slight. I have an entire chart of all white mutations, expanding on the one in the FAQ User Guide to include every possible lethal combination. I unfortunately don’t know how to post a photo of it.

I’m an Equine Science and Management major focusing on breeding and genetics, so even if it’s just on a game, I will never ever breed a potentially lethal foal.

Thanks, but I use my google account for that and that contains my real name which I am not comfortable sharing.

Sounds good, thank you!

He could have gotten one from his sire

He has a 25% chance of carrying DP (Father50 and mom 0)
Sooty (which just darkens the color of the base coat, like the light chestnut/no sty of his mom to say amother chestnut who is SstySsty) and Sooty+ are different. The latter of which you have to buy for yourself or breed mares toa stallion for public breeding who has it.

Personally, with how loud his color is, I'd stick to base colors/no frame, mares with splash or appaloosa. The base mares might still throw color but it won't be as loud, and the splash/appy mares have a chance of making really neat babies

His dam is a sooty pali, not a chestnut
Regardless, he has at least a 50% chance of carrying DP. Mom definitely doesn't have one or she'd be chocolate pali, since she's hom sooty, so we can ignore her for this. That means we look at dad, who is a Pretzel Twist and therefore has at least one but could hypothetically be hom. I can't tell, since he's black and has no chestnut foals to infer from. So lets assume he's het. He'll either pass on his copy of DP or pass on his copy of not-DP, one or the other. 50-50 odds.

Sooty darkens any coat color, darkening both black and red based coats. Sooty plus darkens less but has those fun dapply patterns. These are both on the same locus (the sooty 'spot' on the genetic code. They're both variations of sooty)

DP, on the other hand, stands for 'Dense Pheomelanin', and is on a different spot entirely, so sooty and DP are inherited independantly. Pheomelanin is red pigment, vs melanin which is black pigment. Coat color is ultimately made up of the distribution and dilution and combination, etc, of those two pigments. So DP increases the density of pheomelanin and therefore darkens the red pigment in the coat, and does nothing with black pigment. This is most obvious on chestnuts and other red based horses (e/e) because they have no black pigment to complicate matters. DP and sooty act much the same on a chestnut, and a liver chestnut has three darkening alleles, either two sootys and a DP or one sooty and two DPs. A 'black liver' has all four--hom sooty and hom DP.
DP is harder to spot on black based coats because there's melanin there too, which it doesn't affect. It's invisible on solid blacks like this guy and his sire because they don't have any visible pheomelanin to act on. The melanin overwhelms everything and makes them black. With bays, on the other hand, melanin is restricted to certain parts of the coat, allowing pheomelanin to show through. So DP does darken bays.

Since your boy is hom sooty, if he does have a DP he could throw liver chestnuts with hom sooty chestnut mares. That'd be one way to figure out if he's het DP or not.

Okay, I hope that was helpful and not just babble

Thank you!