I think the point of the matter there is that saurians are not mammals.
An argonian werewolf would be the saurian or reptillian equilavent of a wolf in a half transformed state, as to be suitable.
Or disabiding that, would simply be half saurian, half wolf, having the features of the former; with half the shape of the latter.
http://static.skyrim.nexusmods.com/mods/images/9694-1-1333441925.jpg should work well to exemplify these annotated qualities, for it has the werewolf shape and movement.
While still showing the scales, not fur, of the aforementioned race. Making the combustation of the curse more credible
to the viewer's perspective as a whole. As well to note- the horns would designate it is not of the werecrocodile strain.
But if you go with that logic, werevultures wouldn't have feathers, because there isn't a single playable avian race in the game. Similarly, weresharks would have fur in the case of Nords, Imperials, Redguards, Bretons, and Khajiit.
It also raises the question of what Class mer fall into. Are they mammals, fish, birds, etc?
In my opinion, it makes sense for their to be racial differences among the werewolves, but not to remove their wolf features depending on what you are, because we would similarly have to remove reptilian features from werecrocodiles for non saurian races (and there is only one saurian race), which would hardly make sense considering their werecrocodiles.