Use The Toilet

Although this technique may take a while to work, it is definitely worth it. First, place a litter box adjacent to your toilet. Then gradually bring it closer and closer to the top of seat—you might need some phonebooks or a stool to make the process easier on the cat. Once your pet is accustomed to using a litter box on top of the toilet, transition to a special litter box that fits within the toilet itself. (Buy flushable litter, and expect spillover.) Gradually use less and less litter to get your cat accustomed to doing its business without it, and then, remove the litter box entirely.