Reading your post, it reminds me of what happened to our German Sheapherd when he had a stroke. Unfortunately, my mom didn't take it too seriously at the time (I was 8, so not in a position to do anything) and 36 hours later he had another stroke and died. Maybe a thourough health check is in order, especially given Gunner's age.
If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.