This may sound silly, but we put a screen door on the nursery so our cat and dog could see in but couldn't get close to the baby. It seemed to temper any jealousy and allowed for a gradual introduction. When we moved our daughter from the basinette into a crib, the cat took over her old spot under the blanket! Our golden retriever became very protective w/ strangers but was very gentle with her. Of course,the pets were only allowed in the nursery when we were with her. We have great pictures of the cat and dog peering through the screen door with curiosity at the new sights, sounds, and smells.