I agree with leaving them at the old house until the move is completed. We did a move a few years ago and it took us two weeks between painting the new house and making multiple trips with the stuff we could move (Only going about 10 miles away). We did take the dogs over a couple of time to "see" the new place before the final move.
A little off topic, but whenever we arrive at a new campsite in our RV and put the slides out, Kaiya walks to the back and looks around just to make sure everything is there as it should be and her home is back to normal. Kaylee just wants to go outside and see what's there.