Review on Gooby Comfort X Step In Harness V2 - Large, Turquoise(Pink) - No Pull Small Dog Harness Patented Adjusting Choke-Free X Frame - Perfect On The Go Dog Harness For Medium Dogs No Pull And Small Dogs by Jon Dugan

My Crestie mix has an 18" chest measurement behind the legs, which is a medium according to the size chart. Even adjusted as tight as possible, the medium size was huge on my dog. The D rings were too large to accommodate the clip on a leash appropriate to her size. The chest portion of the harness being too big actually caused pressure on my dog's trachea when she pulled.I exchanged the medium for a small, which fits much better (and still has to be tightened quite a bit, so the chart is completely wrong). The D rings are a better size, and the chest portion is more proportate to her frame. She does not have trachea issues when wearing the correct size, which was the whole reason for purchasing this harness. My dog is extremely protective and strains to head off other pedestrians. We're working on her pulling issues, but she's pretty stubborn!Negatives: 1) The buckles are cheap plastic and have to be readjusted frequently because they slide around; 2) The finish on the D rings wears off immediately. At this price point, the parts should be higher quality.Overall I am fairly pleased with the small sized harness and will stick with it unless I find a better alternative.