To insure proper sizing you will need your dog’s weight and rib cage circumference (to be taken while your dog is standing, behind the front legs at the widest or deepest part of the dog’s rib cage). Note: Do not put your tape measure under the armpits while taking this measurement. If your dog’s weight is close to or at the top of any size order the next larger size.
NOTE: Measurement sizes are approximate. For your dog’s comfort, if your dog’s rib cage and or weight measurements are close to the maximum of a size group go UP a size. The Pet Harness is not designed to fit skin-tight, so it’s better to go with the next larger size and tailor the fit using the adjustment strap(s).