One of the reasons why you might be choosing a pet cat over a dog is that cats don't have to be walked outside. You don't have to give up your morning snuggles and rush to the nearby grounds so that your pet can use the toilet. However, because cats need to go to the toilet too, you will have to buy them a litter box. Read on to see what types of litter trays there are available and which one will be best suited for you and your cat.