Babies and puppies in the home are similar in one respect. They are both learning as they go and can be taught preferred behavior at an early age. But when the puppy enters the household in advance of the baby, it can be a daunting experience, particularly when the pooch feels neglected or it has lost some influence with its masters. No longer being the center of attention can be traumatic. On top of that, a pup now has to also adjust to a variety of new sounds, sights and smells — all of which — can be stressful in a dog’s or cat's early life.