generally you can roughly assume he'll be within a similar weight range of the two breeds. Get him weighed to know his exact weight. The growth spurt you're hearing about is usually filling out.
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Shasta GSD 5/5/10 CGC, ITD
"Dax" Thor z vom Weberhaus CAA, ETD, HCT, RATI, RATN 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013