Take the cat to the litter box, pat its head and butt gently, and tell it to poop in it from now on. When you find that the cat needs to urinate, quickly bring it to the litter box, and then the owner moves away. If the cat urinates in the litter box, reward it. If it wants to come out, the owner should hold it back until it urinates.

Notes on training cats to use the toilet:

1. Start training from an early age. Kittens are easier to train than adult cats. Don't miss the growth process of kittens, otherwise they will become "if you don't train them when you are young, you will become a fool".

2. Training pet cats to urinate and defecate in a fixed litter box cannot be completed once or twice. During the training process, the breeder must have a perseverance mentality and treat every training patiently. I believe that after a period of time, the cat will be able to develop the habit of defecating in a fixed litter box.