There are different scenarios in the life of your cat where you might need a small cat litter box. Generally it is recommended that you should get a big enough litter box for your cat. So your cat feels comfortable moving around in it.
Many cat owners like to start with a small cat litter box though. Kittens learn faster to use a litter box when the stepping in and getting out happens easily. Many of the available models offer a lower side for easy access. Older cats might prefer for the same reason a small cat litter box too.
Cats are clean animals, very clean. They groom themselves constantly, not only when they go to the cat litter box. But there it is very obvious that cats want to be clean. They bury their waste with litter and afterwards they clean themselves. Continuous grooming is in their nature. A research found that cats groom themselves about 50% of their waking time. Fascinating, isn’t it.
Do you know why cats clean themselves so fastidiously? It’s their instinct. Wild cats want to remove all smell of food or waste from their body and fur. They do so after eating, after pooping and even before going to sleep. It’s their natural instinct to keep them safe from being smelled and detected by other predators. And you help your little cat friend by providing a clean big or small cat litter box.