• XS 22-26 cm / 8.6-10.2 inches

• S 26-32 cm / 10.2-12.5 inches

• M 33-42 cm / 12.9-16.5 inches

• L 42-52 cm / 16.5-20.4 inches

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All sizes may vary depending of the length of your dog's neck, independently of their weight size