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XS (25) Neck 18-38cm/ Belly 26-36cm
XS-S (30) Neck 20-44cm/ Belly 38-46cm
S (35) Neck 26-54cm/ Belly 40-52cm
SM (40) Neck 28-58cm/ Belly 46-60cm

Back = back length
Neck = neck circumference
Chest = chest circumference
Belly = waist circumference

Image with information on how to measure your dog correctly