You can purchase probiotics for children or pets, mix them into a syringe with warm water, and feed them to your pet little by little. It is common for cats to have diarrhea when changing their food. If the diarrhea is severe, you can stop eating and treat it. Then carefully observe whether the cat has other symptoms such as listlessness, vomiting, etc. If there are no symptoms, the possibility of suffering from other diseases has been ruled out.