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XXS Back 28cm/ Neck 32cm / Belly 29-47cm
XS Back 35cm/ Neck 45cm/ Belly 56-62cm
S Back 44cm/ Neck 50cm/ Belly 70-82cm
M Back 52cm/ Neck 55cm/ Belly 83-95cm

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

Image with information on how to measure your dog correctly