Finding the right size for your pet can be tricky. Do not measure your pets collar. Measure at the base of your pet's neck making sure to leave some wiggle room (about two fingers thick). If you have a floofy pet make sure to include to the fur in the measurements. Find where you dog fits in our sizing chart. If your pet is between sizes, size up! If you are unsure, don't hesitate to contact us and we can recommend a size.