Siblings w/dun or not?

[Michelle Clarke]

Interesting that they are seemingly the same color but one has stripes - one not. I really think the sooty gene reacts funny with the dun factor. The older boy seems to have more sooty and no dun markings.

[zhiaral]

It's kind of hard to say, on the legs - because the sooty solid black covers all the areas where the other has stripes. Could there be a dorsal strip beneath the counter-shading? Could there be leg bars beneath the black, or shoulder bars beneath the shoulder shadows?

[Michelle Clarke]

I tend to agree - when you have sooty, it can cover up the striping. I think this is a really good example of that.

[fantasykiger]

very interesting picture, it is cool to see them side by side.
It is obvious the guy on the left the is sooty and the one on the right is dun. The thing I have noticed with a sooty buckskin and my friend has one such Mustang. There will be a time of year, usually sleak summer coat, when alot of that black sooty guard hair is shed away and the buckskin coloring comes thru more and that dorsal counter shading completely disappears. It does make a comeback as the coat darkens and the seasons change. But at some point it fades away and then returns. On duns it does not come and go.