That's good, Stacy. It's amazing what dogs can figure out. Some dogs wouldn't make the effort, only seeing the fence.
My "pup", who is 15 months now, terrorizes my cat. Basically, if the cat isn't on me, like it is now, it's either upstairs or in the basement (litterbox and food). So Pierce has figured out he can hide behind a partially closed door, like the bathroom door when I am taking a shower, and look through the crack where it hinges to catch the cat coming or going from the basement to the bedroom. He will lay there without moving a muscle trying to catch movement, like it looks like your poochie is doing.
Give us this day our daily bacon.