I read an article several years ago in a dog magazine (Dog Fancy maybe) that said if you move with a blind pet, walk the dog around your new house on the leash at their normal pace. Let them take in the smell and the location of the rooms and furniture. It takes about two weeks and their back to their old selves. I remember the author saying people didn't even realize her dog was blind because it would go get a ball from it's toy basket and bring it to the guest to play fetch.
that's awesome..if they can live happily, that's so cool