Applying essential oils, toilet water, etc. on the body generally prevents fleas from biting. Using sulfur soap when bathing can also achieve a certain preventive effect. Dogs can use dog-specific external deworming. You should bathe regularly, pay attention to environmental sanitation, clean regularly, and deworm your dog regularly. Do not take your dog to the grass, as it is easy to develop skin diseases. It is also best to wipe your dog's paws after you go out for a walk.