IIRC they were for an earlier version of what became the "Ushnar's Terror" quest which gets you the skinned hound follower. There may be conflicts if you do that quest.
I played with them a little. They are fun, but if the Dog dies, and you cant find it and ressurect it, they become useless. It also appears that the guards attack the ghost dog on sight, but if you take them off before you go into a guarded area, there is no problem, as the Dog (if alive) will reappear when you put the gauntlets back on. It doesn't seem to work to well indoors.
I've wondered if setting the ghost dog to essential will fix the problem, but it may make the ghost dog a bit to OP.