I do think I prefer this age of Peanuts, in terms of art style, to all the others. It's true, when Peanuts' art became simplified and iconic it allowed the strip's humor and voice to aim for the stratosphere, but we also come to lose things like Snoopy's expression in the last panel here. Now that's a depressed dog.
This is a bit more confirmation for the idea that Snoopy belongs to Charlie Brown, I think.