I lost my best friend today...Mommy and Daddy said she left us and that we'll see her again on the Rainbow Bridge.  I'm so sad.  The day was perfect.  We all went on a family run together....the first family run in like 2 months.  We spent the day at home with both mommy and daddy and played ball outside....well Libby played ball and had spectacular jumps...it's like she was flying!  Then mommy and daddy said we needed to run a few errands and we could come along.  We both love car rides and Libby always had the best seat (although she always sat right behind daddy in the car). 
After the library, as we were driving over the bridge heading toward Merritt Island, Libby collapsed and had trouble breathing.  Mommy dove into the backseat to hold her and daddy started heading toward the vet.  Mommy and daddy were sobbing...mommy announced that she was had an erratic heartbeat and was struggling to catch a breath and couldn't hold her head or body up.  Eventually mommy announced that she couldn't feel her heartbeat.  We pulled into the vet a moment later and daddy jumped out and opened Libby's door....he confirmed that she was gone.  it was so sad!  I'm completely heartbroken.  Who will back me up now?  My dearest, beloved sister is gone and I don't know where she went.