Hello. Welcome to hcm.
If you are sure that there are teeth marks on the bite site and there was bood,then he should get full course. Rabies
is a serious disease and almost no cure,it is better to be vaccinated.
Also I advice you to observe the dog if possible for 10days as if rabies was present in the dog,it will die in ten days. He can have normal food as immunization
is not affected by food. If he has fever
or reactions to injection,it is advisable to avoid meat or oil foods till the symptoms subside.
All the best