My dog had a pretty big overbite when she was younger. I didn't notice it until she was 2-3 months. By about 6 months everything was back to normal. I played tug with her but not sure if it had anything to do with it. Other people here have also said they have seen it catch up.
Athena -GSD- born 12/13/12
Luna -Shepherd Mix- born 3/20/99