Board Thread:General Discussion/@comment-25120405-20140705234245/@comment-17114085-20140925120054

Shadowmere is a Daedric horse, I mean he/she is not normal. Last I checked horses didn't have glowing eyes and came out of pools of black water. Like it was stated above Daedra don't have a defined gender, or at least most don't. So we can assume that Shadowmere is like the Princes and doesn't choose to be one gender.