Cats know why they use cat litter.
This is a cat's nature. A cat uses the litter box on its own, just like a human being born without being taught. The same principle applies to drinking milk on its own; it's an innate, unconditioned reflex. Besides innate factors, cats learn to use the litter box later in life. Kittens are often weaned before weaning, and they live with their mother, who then models litter usage on their behalf. 
What kind of cat litter is best for cats?
1. Pine wood cat litter: Pine wood cat litter is made from recycled pine wood, wheat by-products, and other materials with the addition of some binders. This type of cat litter tends to be larger in volume, but produces very little dust and will not affect the cat's breathing.
2. Crystal cat litter: This type of cat litter is made of semi-transparent silica gel, which is relatively lightweight, has good water absorption, and also has a certain deodorizing effect.
