Originally Posted by NdAppy
The reason I keep pushing bay dun is the fact that people will use "dun" to name the color of both red duns and bay duns calling them both "dun" which is not correct.
Exactly. But "dun" is a completely outdated term, just like overo.
With genetic research now, they are able to distinguish the base color (bay, red, black) and then add the word dun.
You can call any horse with primitive markings "dun" no matter what the base coat is. But that's an extreme over-generalization to what dun is.