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XS Back 25.5cm/ Neck 38-44cm/ Belly 58-78cm
S Back 33.5cm/ Neck 48-54cm/ Belly 74-102cm
M Back 43cm/ Neck 55-61cm/ Belly 88-120cm

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

Image with information on how to measure your dog correctly