View the size chart of all available sizes under Product / Size Specifications.
Make sure you measure your dog well from the neck (collar height) to the base of the tail.

Attribute name | Attribute value |
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Size 10 | Back length: 24cm | Chest size: 32cm |
Size 12 | Back length: 27cm | Chest Size: 36cm |
Size 14 | Back length: 30cm | Chest size: 40cm |
Size 16-18 | back langth 39 cm |
Maat 20-22 | Back length: 42cm | Chest size: 56cm |