Thank you for your query on Healthcare Magic.
I advise you to vaccinate your son with rabies vaccine
as per 0, 3, 7, 14, and 28 schedule.
Observe the dog for 10 days from the bite incident and if it is healthy after 10 days you can stop the remaining last two shots with the advise of your Pediatrician
Check his vaccination for Tetanus toxoid
The fever is looking like resulted from an upper respiratory tract
infection as there is cough and throat pain.
For fever you can give Tylenol in prescribed dose.
Consult your Pediatrician for rabies vaccination advise and for the treatment of his throat infection
Hope I have answered your query.