Brief Answer:
Re vaccination not required

Detailed Answer:
Hello

Thanks for the query

It is unfortunate that you got scratched again, since you are already being vaccinated for rabies I would advice you to continue anti rabies vaccination schedule, you need not start all over again. Try to avoid getting scratched by street dogs in the future.
Make sure of the following things

1. The wound should be washed thoroughly under flowing water with soap
2. Any deep cuts should not be sutured as far as possible and it should be cleaned thoroughly
3. Take your vaccination as per schedule and watch out for fever

I wish you good health

Regards

---