Since Minecraft's base engine does not natively support custom entity models (CEM) in resource packs, you must use a mod to bridge the gap.
: The most traditional method. It provides the necessary CEM (Custom Entity Model) support. Fat Cat (Optifine)
: A separate PvP-focused version that applies cat-themed textures to items like wool, TNT, and swords, often featuring cat faces on crossguards and icons. Since Minecraft's base engine does not natively support
The topic primarily refers to a popular community-made resource pack that transforms standard Minecraft cats into "chubby" or "heckin chonker" versions. To function correctly on Java Edition, this pack requires Optifine or alternative entity-modifying mods like Entity Model Features (EMF) and Entity Texture Features (ETF) to support the custom 3D models. What is the Fat Cat Resource Pack? : A separate PvP-focused version that applies cat-themed
A small cute pack that will replace the cat model with a chubby version. Requires EMF and ETF (or Optifine)
: Many community versions offer over 11 different color schemes, including "nebula" (blue/aqua) and "pink" variants.