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.
| Size || Neck Size || Collar Width |
| Small || 10 to 14 inches || 5/8 inch |
| Medium || 14 to 20 inches || 3/4 inch |
| Large || 18 to 26 inches || 1 inch |