This is one of the grey areas in medicine, where no one can give 100% assurance. It is something like this: I am going to chennai from Bangalore. What are the chances I will have a fatal accident. We cannot give a yes or no answer. What I would answer is several thousands travel every day between these two metropolis. considering the volume and inexperience of our drivers, level of alcohol in their blood, the incidence of fatal accidents is negligible.
Our answer regarding rabies
can be answered only in this fashion.
In short, my answer is your start taking the vaccine
on day 0, 3, and 7. That means if you are taking the vaccine on monday, you can take another one on thursday and the third next monday. If on the 10 th day dog is fine, stop the vaccine. After all there is a regimen called pre-expposure prophylaxis. People who regularly work with animals take vaccine on day 0,7 and 21 even BEFORE the animal biting them. So we can assure that this vaccine is so safe.
The reason, is, the anxiety
will kill us. Conflicting advice can confuse us. This is what I did to my mother 21 years ago.
Scratch and bite has no difference. Dogs have the habit of licking their nails.
Regarding the lack of blood, it is certainly reassuring, but that will not give peace of mind.
The answer is yes for your third question.
As far as your final question, don't place any time frame.
You can take the vaccine as early as possible.
In the last 27 years I have not heard any reaction to rabies prophylaxis.
with best wishes