Bay dun mare?

I have no idea. That's a tough one with all the white covering where the normal markers would be. If she's out of a true dun though, I'd guess she was dun.

I will say dun also, but I'd like to see a picture of her dorsal from behind.

The only time I've seen dorsals that are very thin are on Fjords and crosses. Her base color does not seem very diluted to me and it is rather shiny and deep colored for a dun. Dun works by moving all the pigment to the underside of the hairshaft, which makes it so the hair isn't very reflective. This gives duns the lighter coat color and they tend to be "duller" since there is no pigment to reflect back light. But this is a very tough call and I am on the fence to say whether shes dun or not.

^ That is pretty much how I was feeling about it.

If there is a case of a horse needing testing for dun, this would qualify. A real stumper this one... :?

She looks like bay mare with a "fake" dorsal stripe. Here is a picture of my bay dun mare in her winter woolies and behind her (not the Paint) is my bay mare in her winter woolies. My bay mare has a 1.5" super defined dorsal stripe summer and winter, but is still a bay.

I don't see dun, personally.

ACC

I'd say countershading as well

Not Dun.

Dont think shes dun, countershading to me

Too me its too hard to tell in those pics. Do you have or can you get better ones??

Here it is from a different view.

Here's a dun Welsh filly...

I noticed the dorsal was very thin, but I didn't doubt she was dun... Does dun act differently on bay?