Buckle-Down Space Jam Tune Squad Polyester Seatbelt Buckle Dog Collar, Wide Small: 13 to 18-in neck, 1.5-in wide

To select the most accurate size collar for your pet, measure the center of their neck with a cloth tape measure, a few inches down from their head. Pull the cloth tape measure 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 collar and your pet's neck for comfort.