The Decals module allows you to project additional textures over your fur. Up to four decals per material can be applied and each one of them can be layered and mixed in overlay, additive or multiplied mode. These decals are projected using the main UVs of the character. In practical terms, it is similar to adding layers to a photoshop image in a very performant way.
Decals can be swapped at runtime since they are added in a non-destructive way. They can have different offset and tiling values for each decal, allowing great flexibility when customizing your characters.