Poor socialization can result in sensitization, which causes fear that can lead to aggression. Unfortunately, improper socialization happens every day by well-meaning owners. When puppies are forced to meet other puppies, dogs, people or children, it will cause them to become fearful. Fearful puppies will freeze, have dilated pupils, low body posture and piloerection (raised hackles), and are unwilling to take food treats. If puppies are afraid of other dogs and their owner brings them to a dog park, they will show signs of aggression if they’re unable to get away. Call Big N' Small Paws 317