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27 Neck 26cm/ Chest 32-40cm
30 Neck 29cm/ Chest 36-44cm
33 Neck 32cm/ Chest 39-49cm
36 Neck 35cm/ Chest 43-53cm
39 Neck 38cm/ Chest 46-58cm
43 Neck 41cm/ Chest 50-62cm

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

Image with information on how to measure your dog correctly