Lack of appropriate early socialization can lead to fears and anxieties in dogs and have a huge impact on their ability to fit into the family. Early research by John Paul Scott and John Fuller established stages or periods of development in dogs—theneonatal period, the transitional period, the socialization period, and the juvenile period—and the effects that these have on development of the dog. The interaction between the genes and environment are important in development. A newborn German shepherd puppy has a brain volume of 8 cm~3 and all the brain cells it ever is going to have. By 8 weeks the brain has grown to 80 cm~3 and to 120 cm~3 at 16 weeks and is nearly adult size. Increased connections, not new cells, account for this rapid growth.
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机译：缺乏适当的早期社会化会导致狗的恐惧和焦虑，对他们适应家庭的能力产生巨大影响。 John Paul Scott和John Fuller既定阶段或发展阶段的早期研究，过渡期，社会化期间和少年期 - 以及这些对狗的发展的影响。基因与环境之间的相互作用在发展中是重要的。一只新生的德国牧羊犬小狗的大脑体积为8厘米〜3，所有脑细胞都会有。在8周内，大脑在16周内生长至80厘米〜3和120厘米〜3，几乎是成人的大小。增加连接，而不是新的细胞，占这种快速增长。
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