I 'lost' my dog like that once.I thought I lost one of my favorite pet hens. Could not find her on roost she had been using for better part of a year. Could not find her in a tree or other locations hens use based around house. This morning I looked over the entire yard and even went down into the woods expecting to see kill sign like left by a Coyote or Bobcat even though dogs keeping them out very well as far as can be determined. I just about gave and then saw something move around inside the cab of my truck. Door was left open for about and hour during day yesterday. Will have to make certain she is not trying to locate a nest there. She did crap in daughters booster seat.