The dog training blog...

Knowledge of the early growth periods of dogs helps to understand canine aggression. Puppies have a critical need for socialization from three weeks of age, when they can see and hear, until 14 weeks of age. Puppies should best be purchased between seven and eight weeks of age for proper socialization in the new home. Eight to 10 weeks is a fearful period, during which the puppy must not be harshly disciplined and must be handled gently by adults and children.

Fourteen weeks starts the juvenile period -- the dreaded adolescence -- that ends when the pup achieves sexual maturity, usually at about 14-15 months of age. If a puppy has not been socialised by the time he is 14 weeks old, he may never be trustworthy around people or other dogs.

Puppies raised in kennels where they receive very little human handling will often remain shy of people, particularly if they are not sold prior to 14 weeks of age. They may always be fearful, especially under stressful conditions.

Dogs reach sexual maturity at six to 14 months of age. During this period, they usually begin to bark at strangers and become more protective, and males begin lifting a leg to urinate. Introduction to strangers (adults, children, and other dogs) on the home property during this period is important as well, especially if the pup has missed out on early socialization.

Source: Dog Owner's Guide

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