Likewise we have experienced a similar loss. It was as if I lost one of my children - that was 7 years ago and I still get tears! It is my belief that they will all be waiting for us on the other-side when our turn comes!! Ours stuck around the house for a week or so after the passing - we could hear her footsteps in the kitchen and an occasional bark at the back door. A house visitor heard it as well.
I share your loss!
I share your loss!