Age

Question
At what age do german shepard puppies stop growing

Answer
It is a hockey stick thing, rapid at first and then leveling off.  They have most of their adult size by 6 months, but continue slow growth some of them even into their second year.  I think the larger individuals continue their growth longer.  Check the ends of the leg bones.  If they are still much knobbier than an adult's, the growth plates are still open and it is still growing.  If not, do not expect much more growth.

You may find this link interesting,   http://jn.nutrition.org/cgi/content/full/134/8/2027S