Hi. My son was bitten by our dog last yr and had vaccine. But i cant remember if it's 3 or 4 shots. Last week we saw a wound on our sons leg bit we are not sure if it's a dog bite. The puppy we had just died but didn't show any signs of water phobia, drooling etc. Does the vaccine that my son had last year is still effective? The wound is superficial btw.does he need another shot for the anti rabies vaccine? Thanks in advance for your help.