How do you fix lack of socialization in dogs?

Sign up for a well-run puppy socialization class where your dog can meet new friends and learn the rules of friendly play. Create a checklist of different types of people to meet, but make sure that participants let your pup approach them on his own time. Gently expose your puppy to different noises at low levels. Carefully introduce household equipment, like brooms and unplugged vacuums. Allow him to explore different surfaces, like sidewalk grates and slick floors. Encourage him to check out objects like parked bikes, garbage cans on wheels and strollers. Work through your puppy’s socialization checklist slowly, always allowing your pup to move at his own pace, and always making sure that he has an escape route from the action should he need it. The secret to socialization success is to make sure that it’s always a positive experience for your puppy. Forcing him to meet someone he’s tentative to approach might actually backfire and reinforce any underlying fear.