What is the possiblity of getting rabies bitten by a street dog in Berlin. By street dog I mean the dog of a homeless person. Is there a high chance of rabies from that. I must say that I didn't provoke the dog. I don't know what provoked it, it came all of a sudden from behind barked for 3-4sec and bit me. I know Germany is rabies free. But I assume since it is a street dog. I am not sure if the vaccines were provided to the dog. In such a case what should I do. The doctor who I contacted said Germany is rabies free and refused to give me anti rabies vaccine. What should I do in such a case , I am unable to find another doctor, and I am not sure how do I go about finding another doctor here. I am very new to the place and language is huge problem.
In answer to the question in your title, "What is the possiblity of getting rabies bitten by a street dog in Berlin?": the possibility is zero, since (as the doctor correctly told you) Germany is rabies-free. For more details on Germany's rabies-free status, you may wish to read the answers to this question and this question.
In answer to your final question, "What should I do in such a case?": you should do nothing other than getting on with your life, since Germany is rabies-free.