When the first two puppies arrived, we eventually brought them into the house to see how they would do. We were concerned that our 3 adult dogs might act too aggressively and hurt the newcomers, so we left them outside and introduced them one at a time. What we got was a lesson in canine sociology.
When our most submissive dog, Bridget, came inside, the two puppies ran toward her yapping all the way. Bridget was scared to death! She jumped into a chair, and when they got too close, she flew a couple of steps across the room on her long, lean legs and oneo the couch.