Size Neck Circumference
 XX-Small  7 - 9 inches
 X-Small  9 - 11 inches
 Small  11 - 13 inches
 Medium  13 - 16 inches
 Large  16 - 22 inches
 X-Large  18 - 26 inches

* If you are in between sizes just let us know! All products can be custom tailored to your pet.