Dog Bite consulatation. Of the same?

There's a stray dog in my building who has attacked people in front of me and 3 days ago it attacked me too. I was wearing track pants so its bite couldn't even give me a scratch but I sort of felt its teeth touching my skin. It was not that harsh. I know 100% that it hasn't penetrated through the skin. Within half an hour I went to my family doctor who told me to go through the whole course of 5 injections for the sake of safety as the dog doesn't seem to be normal and might be infected. He gave me 2 injections on the very 1st day. 1st was tetanus and the 2nd was the one out of those 5 shots. My question is, is it necessary to go through the whole course? If no, I don't mean to sound careless but can I just leave the course in between, are there any side effects of the same?