I really wanted the Flagline harness for the handle and security. Measuring my dog, he was 22 inches, which puts him on the edge of XS and Small. The FAQs say to size up. But the measurement that was missing is the belly side of the harness. Adding this to the sizing charts would be very helpful. So at 22 inches I ordered a Small. But the belly side was way too long, it covered and rubbed the nether region of my male dog. I contacted customer service and was told that the XS is 2.75 inches shorter and will still fit 22 inch chest perfectly. This made a big difference! They helped me to quickly submit an exchange and order the XS. This size fits perfect! In the exchange I had to change from the black to the salmon color and LOVE the color! Picking up my dog by the handle seems very comfortable for him. I can't wait to go explore!