2#， suitable for weight less than 3.5kg， chest 35-40cm， neck circumference 20-25cm，?(within the proposed 3.5kg)
3#， suitable for weight less than 5kg， chest 40-45cm， neck circumference 25-30m， (within the proposed 5kg)
4#， suitable for weight less than 7.5kg， chest 45-55cm， neck circumference 28-33cm，(within 7.5kg is recommended)
5#， suitable for weight less than 11kg， chest 52-57cm， neck circumference 31-38cm， (recommended 11kg)

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