PRESS PHOTOS BY TIM GILMANThe Lehigh Valley Pet Expo attracted many families with their children and pets, mostly dogs and cats on leashes. Many of the pet lovers were newcomers to the annual exposition in the Agri-Plex building at the Allentown Fairgrounds, put on by Family Pet Shows Jan. 29 through 31. Visitors enjoyed a petting zoo, pony rides, pet-related vendors, demonstration arena, animal