Sorry for double posting, ran out of edit time.
Originally Posted by Corporal
This horse definitely has what it known as "black points", which are the black above the knees and hocks.
I've got a Dun QH and I've learned that "Dun" is a throwback to a prehistoric color pattern. They must have a stripe down the back, a cross over the shoulders--both are seen on donkeys--AND they have 3-5 zebra-type stripes on both front forearms.
I'll try to get some shots of these on my horse, "Buster" to show you. The dorsal stripe is pretty obvious, but you have to look harder for the forearm stripes, which may or may not be on the horse you are interested in. =D
No, black points are not black above the knee. Black points are caused by the agouti gene which restricts black to the lower legs, mane, tail, nose, and tips of the ears.
And dun markings consist of a dorsal stripe that looks like it was drawn on by a marker (one that fades out on the edges, not hard edges, is countershading which is unrelated to the dun gene), shoulder barring (not actual stripes, but dark patches on the shoulder) which do not look like the crosses on donkeys, and the number of zebra stripes on the legs is not limited. I have seen some with just a couple and I have seen horses stripes all over their leg.