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S Back 37cm/ Neck 26-30cm/ Chest 34-38cm
M Back 41cm/ Neck 28-32cm/ Chest 38-42cm
L Back 44cm/ Neck 32-36cm/ Chest 42-46cm
XL Back 51cm/ Neck 36-40cm/ Chest 46-50cm

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

Image with information on how to measure your dog correctly