XS (15 ~ 20cm) 【Newborn baby meow about 3 months, cup dogs less than 1kg, etc.】

S (20 ~ 25cm) 【growing meow about 6 months, mini dogs about 2kg, etc.】

M number (25 ~ 30cm) [adult meow more than 10 pounds, toy dogs, etc. about 3kg]

L (30 ~ 35cm) [fat meow, small dog about 6.5kg, etc.]