LOVING this thread sooo much.
I've always thought this captured Jackson pretty well, in that most of the time he's just... happy. I wouldn't really say he's necessarily "goofy" (like this pic could lead someone to believe) but just pure happiness when he's doing something he loves, like running outdoors. He really is a very happy dog with a GREAT life.
But on the flip side, he has a very serious side too.
And he can be just... sweet.
I really like this recent picture I took of him for some reason. I think it just sums him up. He's happy, sweet, alert, focused on me, and ready for any fun you can throw at him.