To get the most accurate size harness for your pet, measure the girth of their chest, around the widest part of your dog's torso right behind the front legs, with a cloth tape measure. Pull the cloth tape snug, but not tight. If you don't have a cloth tape measure, you can use a piece of string and measure it with a rigid ruler afterwards. Make sure there's enough room for about two fingers between the harness and your pet's chest for comfort.
|Size||Neck Size||Chest Girth|
|X-Small||7.9 to 13.4 inches||9 to 14.9 inches|
|Small||9.4 to 14.9 inches||12.6 to 20.8 inches|
|Medium||12.2 to 19.6 inches||16.5 to 27.1 inches|
|Large||15.7 to 26.3 inches||24.4 to 42.1 inches|