If you have had the rabies vaccine and have been bitten again, you do not need the shot if it is within 3 months, and you need a booster shot if it is after 3 months. The rabies vaccine will make the body produce certain antibodies and maintain them in the body for a long time, usually for 3 months. So within 3 months of being bitten by a dog again there is no need for another shot, you can just do the wound treatment, if there is bleeding be sure to carry out strict disinfection, squeeze the blood outward from the wound and then clean it. However, if it is more than 3 months, a rabies vaccine booster shot is needed to quickly stimulate the body to produce more antibodies to neutralize the rabies virus. If you are bitten by a dog again after more than 6 months, you will need a new rabies vaccination. The rabies vaccine is not a lifelong immunity. Even if you have been previously vaccinated, there is still a risk of rabies occurring when you are bitten by a dog again, so it is important to take active measures to deal with it. If the wound is deep or on the face, rabies immunoglobulin is also required.