I love the look of this harness, the fact that it’s not an over head fit and it’s easy to fasten. It’s fantastic quality and looks great on my pup. I purchased based on the measurements/weight and grabbed a 3.5. We tried it on Archie and while it fit we weren’t quite sure if it was how it was meant to sit on him. We happened to meet the wonderful people of Barkley and Pips shortly after purchase at an event and they were so helpful. They fit Archie in the harness and confirmed it was a good fit but if I wanted I could go a size up for some room to grow. I ended up going with a 4 and it’s perfect. Really appreciate the genuine care and attention. Great people selling high quality products. Highly recommend!