Rule of thumb: a male needs to reach half his final weight by 4 months. He should weigh between 34 - 48 pounds at that time. Females should hit 1/2 at 16 weeks. She should weigh 30-42 pounds at that time.
From 8 weeks until about 7 months, they need to grow 2- 3.5 pounds a week. After that, they slow a lot.
At 7 months, they should be one inch short of final height at withers.
http://jn.nutrition.org/content/vol134/issue8/images/large/2027Sf01.jpeg
This is in kilograms, not pounds, and shepherds would be above the labrador curve.
http://jas.fass.org/cgi/reprint/78/1/27.pdf
This is a technical article, and based on smaller gsd's used for guide dog work.
http://www.vivo.colostate.edu/hbooks/pathphys/reprod/petpop/early.html
Here you can see that bone growth abnormalities in dogs neutered very young leads to longer bones, taller, and more final weight. Just don't do it, but if you do, expect a taller, heavier, misshapen dog.
http://www.nwk9.com/weight_height.htm
This chart is useful, but for very fit, even thin, working dogs. Most people would want their dogs a little heavier than this.
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