There are several ways to induce vomiting in cats. First, you can feed the cat with hydrogen peroxide or soapy water to stimulate its stomach, causing it to have a vomiting reaction. Second, you can feed the cat some cat grass to stimulate the stomach wall. Then it will vomit; third, you can open the cat's mouth and use a brush to gently touch its throat to induce vomiting; fourth, you can directly touch its throat or the base of the tongue with your fingers to prevent the cat from vomiting. The center is relatively developed, so it is generally effective in inducing vomiting.