As a general rule, socialization is a life long thing. I continue to socialize my male to new things. For puppies, provide lots of great socialization for the first year of life especially when they are 10 - 20 weeks of age. That's my guidelines, anyway.
SG S-Hunter vom Geistwasser CA CGN TT (Airport Wildlife Control K9)
Zenna vom Geistwasser
"May my enemies live long so they can see me progress."