To fix lack of socialization in dogs, use a shorter leash, whether your dog is fearful or aggressive, using a shorter leash is a great way to keep him under control. With a three- or four-foot leash, there’s less distance between you and your dog, and that means more control. Use a muzzle, muzzles might not be pretty, but they can be life-savers, particularly if your dog has a history of aggression. Invest in training, the best way to help your dog if you think he is not well socialized is to invest in some training, to start with, make sure your dog knows basic commands, like “heel,” “sit” and “come,” all of which can be helpful if your dog starts to act out. No matter their age, all dogs can be socialized, if you feel up to it, you can try socializing your pooch on your own, this is more appropriate for dogs that are slightly fearful. The socialization of dogs that are very fearful or aggressive is better handled by a professional trainer. Instead of panicking, try turning the negative into a positive, use a command like “sit” or “watch me” to get his attention, then praise him or reward him with a treat for complying.