Early socialization has a lot to do with response later on. Because I help train Springers, I've got to watch a number develop. Recently, I worked with 2 litters (same sire same dam), one litter grew up with considerable contact with families and children; the second were raised more or less in isolation. In training and trialing, there are a lot of similarities between the litters; but that second litter is strikingly unsocialized.