Small:Total length :7.8 inch/20 cm;Suitable for neck size:6.2-7 inch/16-18 cm
Medium:Total length :10.2 inch/26 cm;Suitable for neck size:8.6-9.8 inch/22-25 cm
Large:Total length :12.5 inch/32 cm;Suitable for neck size:11-12.2 inch/28-31cm
Please measure and check the size certainly
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