There are several reasons: First, it is likely to be caused by environmental factors, such as sudden cooling, changes in environment and cat food, etc., which cause the cat to have a stress response, resulting in a decrease in the cat's food. At this time, an appropriate amount of probiotics can be fed bacteria. Secondly, the cat is infected with parasites, or the parasites in the body multiply abnormally. A large number of parasites cause damage to the gastrointestinal tract, leading to parasitic gastroenteritis. Regular deworming is recommended.