Cat: Of Undying

: The Totem of Undying will not save you from the /kill command or falling into the Void in the standard game. Totem of Undying - Minecraft Wiki

(40 seconds), which is critical for surviving if you fell into lava. Cat of Undying

: If you take fatal damage while holding the totem in either your main hand or off-hand , it automatically activates to prevent death. : The Totem of Undying will not save

: Upon activation, the totem restores a small amount of health and provides several temporary effects: Regeneration II (45 seconds) to heal your remaining hearts. : Upon activation, the totem restores a small

If you are looking for the "Cat" aspect specifically, you can use the Kitty Totem of Undying resource pack from Modrinth to change the item's texture to a cat. Some players also use custom resource packs to wear the totem as a mask.

(5 seconds) to give you a temporary buffer of extra hearts.