Should I Take Another Dose Of Anti Rabies Vaccine For Dog Bite?

I have taken anti rabies vaccination (verorab) of 5 doses in last december. 2 days ago a dog bit my hand but I could not see any scratch or blood on the area(I am not sure there might be one). I did washed out the bitten area after 1 hour. Now I am really confused and scared and want to know should I take another series of vaccination. Please help me and clear my confusion.. thanks in advance