Depends a lot on the bloodlines. Some dogs show their inherent drives very early. Some show then later. This is where the breeder becomes important and their knowledge of their lines. They should be your best source of information.
Certain things I expect to see early on. Food drive, hunt drive being two that I expect to see at 7-8 weeks.
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Vala SchH3 AWD1 FH2 CGC B/HOT, SG1 Deja IPO3 AWD1 KKL1 B/HOT, SG Elena BH AD CGC B/HOT, LB (the ugly little sable) B/HOT, Donovan IPO1 TR2 AD, and gone but not forgotten, Nike SchH1 OB1 TR3 AD CGC HOT, Treue SchH3 CD CGC HOT