Hi Shyloh He is just a straight palomino; what you see along his back is generally called shadowing which a lot of palominos have, particularly at certain times of the year. It also seems to be more common when one parent is smutty - I've seen some ripper shadowing, false dun factors etc on horses that have a smutty parent. Apart from which I don't think there are pure-bred genetic dun Welshies anyway (no doubt someone will correct me if this isn't true* ) so his sire would be a buckskin and if neither parent is a genetic dun he can't possibly be a genetic dun either. The shadowing doesn't make him ineligible for paly registration at all so if you want to get him registered, go right ahead **). The coloured hairs in his mane and tail probably come from the liver chestnut dam and are possibly a legacy of the shadowing along his back. They may go against him to a degree in paly classes depending on the judge but ultimately good paly judging comes down to conformation in the end so I wouldn't worry about it too much.