In addition to what flaming said, mods are completely different from plugins (which is what BC uses). A forge server (which allows mods to be used on your server) requires that everybody playing the server download and run the exact same mods, which isn't practical.I know that there are certain texture packs that you can download in order to make dogs look different from their vanilla textures, I suggest you look into getting one of those if you want to see a difference in their appearance.