The chances of you getting rabies is highly unlikely, well look at the odds, first the dog had to be rabid next wen you spray the content on your leg doesn't fly around as tiny droplets, virus is considered non infectious once the material has dried out, so you using the same bottle again after 50mins, it would have long dried out, so the risk of your inoculation is very very low, but if you are still not able to get over it, then you might take rabies vaccine (for peace of mind), and to be safe in case of any future attacks from dogs
Are you saying you may have rubbed the spot on the leg that got possible saliva on it with the cut on your finger? Hard to know. It sounds to me like it was the shower or spray that got on your finger. If you have any concerns see your doctor.
mkh9