Socialization is the time when your young pet dog will be experiencing and interacting with various people, situations, places, and many other factors while it is still young. During the first eight weeks of your puppy, they will start to develop and become shy and wary of people that are unfamiliar. When your dog reaches about five months, it will them become fearful of strangers, which can turn into aggression. Dogs that don’t know how to socialize may be agitated or weakened when they are faced with unfamiliar stimuli. This is because they don’t know how to interact.