Collins English Dictionary shows Mr and Dr without the dot. The oldest English primer I have shows them with a dot. There are some wonderful examples of dated construction eg :
Dr. Thos. Smith, M.P., a brother of the famous Harley St. surgeon who recently toured the U.S.A. was married on the 4th inst. in St. Margaret's Chapel, Westminster.

I think we've moved on from that.

Stu