Board Thread:Skyrim/@comment-122.2.224.142-20160714075330/@comment-59.101.139.201-20160714081551

Arvak is dead and only his bones are left. As saddles are mainly composed of organic material it is most likely that said material has decomposed and any non-organic material has fallen of. Could just be that purple flaming skeletal horses don't look as cool with saddles.

However being purple and flaming....