Well, my deer!
We took one section of our walk this afternoon in the opposite direction, and as we were walking along I thought there was another dog coming up behind us- turns out it was this fellow (or lass)! Holly was not sure what to do. Moments after I took this she let out a woof and the deer took off. But she didn't chase it- I guess it's size made her a bit nervous (it stood as tall as me!).