The snot-like liquid flowing out of the cat’s anus is the cat’s gastrointestinal mucosa and intestinal fluid. Cats with this symptom are mostly caused by the food they feed in daily life is too high in protein. It is recommended that owners change the cat’s food and try to eat as light and less food as possible. This situation will also occur if there is less salt and oil, and there are parasites in the cat's body. The owner should deworm the cat regularly.