I am happy to report that Daphne, the new puppy in the house, has adjusted well and pretty much immediately. Her only drawback is that she still thinks pooping and peeing should be reserved for inside the house. She took a shine to the other dogs and especially to Fergus, no doubt because he's the closest to her age and playfulness.
Here's a couple of brief videos of Daphne and Fergus playing. They're using Seamus' giant bed as their wrestling mat: