Keeping the litter box dirty :
If you’ve never adopted a cat, you’re probably under the idea that it doesn’t actually care about its litter. You’ll be surprised to hear that cats are hygienic animals who will never go to the bathroom where the litter is dirty and stinky. This is a common mistake made by new cat owners, and if you don’t clean the litter, you’ll wonder why you got the cat in the first place after discovering that it discharges itself wherever in the house. If your cat refuses to use the litter box even though it is clean, it could be suffering from a urinary infection. Such circumstances are beyond your control, and you should consult a veterinarian.