Cat element can be used to combine Armadillo, Catnip, Keyboard Cat, Lion, and Origami in Little Alchemy 2. Making Cat is a complicated process, we have figured out three ways to achieve the goal. The simplest method is to combine Night and Animal, which takes 17 steps. All the three ways need to make Animal first. Check out the detailed walkthrough and try it yourself.
Fire + Earth = Lava
Lava + Earth = Volcano
Water + Water = Puddle
Water + Puddle = Pond
Water + Pond = Lake
Lake + Lake = Sea
Earth + Sea = Primordial Soup
Volcano + Primordial Soup = Life
Earth + Earth = Land
Land + Life = Animal
Method 1: Night + Animal, 17 Steps
Earth + Earth = Land
Earth + Land = Continent
Continent + Continent = Planet
Fire + Planet = Sun
Time + Sun = Day
Time + Day = Night
Night + Animal = Cat
Method 2: Coconut Milk + Animal, 22 Steps
Plant + Big = Tree
Sand + Tree = Palm
Fruit + Palm = Coconut
Earth + Water = Mud
Air + Air = Pressure
Earth + Pressure = Stone
Air + Stone = Sand
Sand + Mud = Clay
Clay + Life = Human
Human + Stone = Tool
Tool + Coconut = Coconut Milk
Coconut Milk + Animal = Cat
Method 3: Milk + Animal, 24 Steps
Earth + Water = Mud
Air + Air = Pressure
Earth + Pressure = Stone
Air + Stone = Sand
Sand + Mud = Clay
Clay + Life = Human
Animal + Human = Domestication
Domestication + Animal = Livestock
Earth + Life = Soil
Life + Soil = Plant
Earth + Plant = Grass
Grass + Livestock = Cow
Cow + Water = Milk
Milk + Animal = Cat