Cats can be sterilized when they are almost 4 years old, but before undergoing sterilization surgery, you need to take the cat for a physical examination to see if the cat's physical condition is suitable for sterilization, and to confirm that the cat is in good health and will not have an allergic reaction to anesthetics. Sterilize or neuter to avoid surgical accidents and harm to the cat. Especially for female cats, the risk of sterilization is relatively high, and special attention needs to be paid after the operation; if a male cat is neutered again at the age of four, he may still urinate randomly, so it is best for male cats to be sterilized before they go into heat.