Usually we say, if the pet animal is vaccinated in the last 1 year period with 2 doses of a potent vaccine in a right schedule- then one may think of observing the dog for 10 days and then decide.
Since Rabies is a deadly disease, its wise not to take chances.
Whatever be the immunization
status of the dog, have your kid vaccinated with Rabies vaccine
The usual schedule is 0, 3, 7, 14, 28 days . The dose on 90th day is optional.
Hope my answer helps you.