That's a beautiful dog! Def could have GSP! I grew up with them and they were great family dogs. I don't know how many pictures my parents have of me just climbing all over them, and then not caring at all.
He's about 60-70 lbs. We've been visiting him over the past month. He's been a research dog his whole life so we'll have some issues to deal with right off the bat but my boys adore him and he thinks they're fun too