Depends on who you ask. There are windows where socialization techniques are more effective. General rule of thumb for those is younger the better and you generally have a better time of things if it isn't smack dab in the middle of a fear period. Outside of those windows or if you think you missed one you don't just throw up your arms and give up. Socialization is still effective outside of those windows, you will just maybe have to work at it more.
Where a lot of people make the mistake is they assume they socialize in those windows and then they can just stop. That is not the case. You socialize throughout the life of the dog but certainly want to make special note to do it a lot in the first year and a half to two years of the dogs life.
Last edited by Baillif; 12-03-2013 at 10:05 AM.