For these dogs, new people and other dogs can be scary. Some react fearfully. Others turn their fear into aggression. This can sometimes be the case with older rescue dogs taken from neglectful or abusive situations. But it can also happen with dogs who didn’t get the opportunity to mingle as a puppy – like during a pandemic quarantine. Fearful behavior when around strangers and/or other dogs. Behaviors might include flattened ears, lip licking, yawning, cowering, avoiding eye contact, and tail tucked between the legs. Aggressive behavior when around strangers and/or other dogs. Behaviors might include intent staring, holding ears erect, excessive barking, snarling, growling, and snapping. Dogs learn how to interpret the world around them between the ages of 8 and 16 weeks. This is when they learn that other dogs can be friends and new people aren’t dangerous. Living with an unsocialized dog can be stressful, whether it hurts to see your dog so fearful or you’re terrified he’s going to hurt someone else.