One of our new hiking friends brings her friend's dog on many of our hiking adventures in the High Sierras.  Cinnamon is a superb hiker.  She watches over her human companions with a caring eye, never straying far from the trail, even when bolting after a squirrel or two.  On this occasion, she was fixated on something across a valley.  We never were able to locate the subject of her rapt attention.  She stayed this way for 3 minutes or so, then joined us once more.