How to retrain a cat to use the litter box. has your cat stopped about this wikihow. lots of things to try to get my cat going in the litter box
Most cats are happy to use a litter box because there's always a reason they stop using their box and it's not to make you mad or get revenge take
If your cat is neglecting to use the litter box, check out some information as to why this might be happening and how you can fix the problem.