Your child has read Dog Man forty times and can quote every fart joke. Good. Now here's the shelf of what's next: graphic novels with the same easy, keep-turning pages, but with a real story and a bit more heart underneath the fun. If they loved Dog Man, any of these will land, so pick whichever fits the mood and let them go.
Any one of these satisfies the whole point of the path, which is 'more than Dog Man, still a graphic novel.' The books are lined up roughly by how silly-versus-story they lean: Hilo keeps the biggest laughs, Amulet and Wings of Fire go the most epic and serious, The Cardboard Kingdom is the warmest and most down-to-earth. Pick by your child's mood on the day. If they want action and heart, hand them Hilo. If they want to sink into a big fantasy saga, Amulet or Wings of Fire. If they want something real and funny about children being children, The Cardboard Kingdom. The path is done the minute they find one they love.