Not exposing your animal to a variety of other pets increases your chances that your critter will grow up to not appreciate other animals’ company. Without early socialization, innocent play can easily turn into a fight. Discomfort and fear can lead to aggression, so while an animal might seem angry, they might actually just be plain scared. A reactive pet that is in aggressive attack mode might simply be under-socialized and not have the right skills to handle what they consider stressful situations. Instead of running away, these pets act defensively in reaction to whatever is frightening them, whether that be a person, another animal or a motorcycle. Unfortunately if this socialization doesn’t occur, small things can set them off. Even seemingly benign things like shopping carts can make these animals cower and run away. These pets experience a tremendous amount of anxiety over anything that’s new. Dogs and cats without proper socialization tend to have very small worlds, going outside is full of so many new people, places and things that it’s simply too scary for them to leave the house. So under-socialized dogs and cats will resist going for walks or meeting new people.