I really like the "A dog says..." mod and think it'd be cool if animals could be outfitted with armor as well. I guess this might be slightly more complicated to implement since animals don't have any sort of "outfit" options. But something as simple as small, medium, and large animal armor (for different animal types) in tiers (metal/fabric type) would be cool.
Here you go : https://steamcommunity.com/sharedfiles/filedetails/?id=1541438907 :)