What are you feeding him? You don't want him to grow fast, but if he's going to run more along the xtra large end of the breed, I'm not sure how fast they grow as young pups. They all grow crazy fast at this age.
You might want to stop the free feeding him though. Put his food dog, offer it three times a day, for about 15-20 min a time. This will also help w/ the potty training for his poop. If allowed to eat all day long, he will be wanting to poop all day long. Dogs love routine.
I've her different ideas on Puppy vs Adult. some never feed puppy, others feed puppy until they're close to 18 mos.
Are you going grainless because from what I understand the only grainless food to give a puppy is Orijin Large Breed.
Check out the feeding section, there is tons of info there. There are also lots of members w/ giant/extra large GSD's here, so I am sure that they can help you more than me. My GSD is 6 mos and 51ish lbs. She's a skinny girl...
Zeva Female GSD 10/02/2009
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Waiting at the Bridge:
Buddy ~ GSD/Husky mix 1/00
Sadie ~ GSD 10/05
Lady ~ GSD 5/09
Pepper ~ Beagle 12/09