So our puppy, Brewster, went to Hal's home, and Hal came to ours.
Ms. D had a hard time with the change. It didn't help that the swap was made on Blackbelt Daughter's birthday. Transitions and holidays are hard for kids like mine, and we had two in one day. Mr. I was a bit off too, but he spent most of the day with friends. He did, however, leave the door open while getting the mail, so the dog ran out the front door. He and his friend chased Hal, who then darted inside to a corner in our living room and peed on the floor. Ms. D froze through all this excitement. She does that sometimes when she gets overloaded with emotion or input. But as the day went on, the kids and the dog calmed down. I tried to calm myself down so that they could match my emotional level rather than the other way around. It seemed to work. We were even able to have an enjoyable time with family for Blackbelt Daughter's birthday dinner.
Even though having the dogs trade places for a few days can have its challenges, I think it will be a good thing for everyone. I'll let you know how it goes.