I understand your concern for your child. When a child is bitten by a dog, you need to ascertain if the dog is a stray one or a domestic dog which has been vaccinated.
If your child was bitten by a stray dog and the bite was unprovoked, the Rabies vaccine
with its allotted schedule is started with immediate effect and the dog is observed for a period of at least 10 days. If the dog remains alive and healthy even after 10 days, there is no need to continue the vaccination
as it is unlikely that the dog would have transmitted rabies to the child.
Thats why the doctor asked you to discontinue the vaccine as the dog was still OK.So dont worry your child does not require a complete course of vaccination for this particular incident.