Cats’ gastrointestinal tracts are relatively sensitive. If there is no transition period when changing food, the cat will not adapt to it, which will cause vomiting, diarrhea, etc., and even death of the cat in severe cases. There must be a transition period when cats change their food. Mix the old and new cat food, and slowly add new food. This process takes about a week. You can also add a little probiotics to the cat food to help the cat regulate its gastrointestinal condition. If the cat is in a sick stage, , it is not recommended to change food. At this time, the cat's resistance and physical fitness are relatively poor. It is best to wait until the cat recovers before changing food.