mmmh, in my experience ( only have raised 2 pups, and had 2 litters so far) the "fast" growing period ends at about 7-8 months, than they grow slower (in height that is). At about 9-11 months they reach their height, now muscle starts ot build, This might give them a bit more height, esp. in males, but not much. You will see the overall dog grow (muscle, bone) untill 3-4 years for males. Females are usually done at about 2 yrs.
I am only talking about the FCI lines that I know

KNPV lines could take even longer?