The sighting is quite credible: the location of the sighting was one of Livvie's favorite spots, Marion Park in SE DC. This is where the very first sighting took place and where the last track ended. The sight-er reported that she was playing with another dog but, when the other dog's human tried to approach, she ran away. Still, not only is she alive and ok, she was playing with another dog! This made my day/week/month and I counted it among my most joyful blessings at Thanksgiving. (This post is a belated report of the sighting because I was out of town for several weeks due to a sudden death in the family.)
We decided not to track from it because it is already central in the area we know she wanders. What we did instead was canvass all of the houses that border the park, handing out flyers and business cards and asking them to watch out for her in and around the park. The neighbors were very receptive, so we are hoping this will generate another sighting.