If socialization is neglected during puppyhood, what might the natural aloofness solidify into?

Answer

Unwarranted suspicion or reactive behavior

Neglecting socialization teaches the dog that novel stimuli are abnormal, causing the natural aloofness to solidify into unwarranted suspicion or reactive behavior.

If socialization is neglected during puppyhood, what might the natural aloofness solidify into?
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