Hurtta Padded Neoprene Dog Harness with 3M Reflectors for Safety NO TWO DOGS ARE THE SAME - Dont guess on the size. Use the size chart along with the Measuring Your Dog size guide. The chest measurement is the most important for harnesses EVERYDAY USE  Quick and easy to put on Hurtta harnesses are suitable for active walks for all dogs. When the dog pulls on the leash, the harness distributes pressure evenly COMFORTABLE - Thanks to the wide Neoprene padding and ergonomic design, the harness is comfortable to wear for extended periods of time by not chafing VISIBLE - The harnesses are fitted with efficient 3M reflectors built into the webbing for maximum visibility at night FOR ACTIVE DOGS - With the addition of a perfectly placed fastener, the armpit padding stays in place when the dog is moving, providing protection from the clip buckle