Any photos of his head and tail? He looks a LOT like my bay colt when he was turning grey. But to be grey, he would have to have one grey parent. But that's pretty much how my colt started graying out. You could also really see it in his tail and on his face.
If he's not greying out, then I don't know.
PS. Do you know what kind of spotting pattern his sire had? There are some patterns that sort of "roan out" like sabino. But I don't think those spots typically start on the back. But it would be interesting to know what kind of spotting his sire had.
If he's not greying out, then I don't know.
PS. Do you know what kind of spotting pattern his sire had? There are some patterns that sort of "roan out" like sabino. But I don't think those spots typically start on the back. But it would be interesting to know what kind of spotting his sire had.