This happens several times a week, proving that instant gratification is not purely a human weakness. He doesn't seem bothered by the reality that opening day is still 3 months away.
I've heard that dogs have no concept of time, at least in certain context. None I've seen need a clock to know it's feeding time. When it comes to elapsed time or relative time, however, I'd be inclined to agree. How else to explain the same surge of joy whether you've been gone two hours or two weeks?
It must be nice to spend your time not burdened by regrets and fears or wishing you could re-create the glory days. Now is all there is and if something not so good is happening now, well, every second is a new now.
Time only matters when you're getting paid by the hour anyway.