Good news - the missing puppy, Ingeborg, has been found! Within mere hours of us posting of her disappearance, we got word that she was back with her raisers, safe and sound. We don't have many details, but she is home - and that's all that matters! Thank you everyone for your help and your kind thoughts.
Added 2.9.10, 2:30 pm: Here's a link to a news story with all the details of Ingeborg's return.