Measure the circumference of your dog's chest above the front legs and the circumference of the chest circumference below the front legs and add an extra 2 centimetres to the result.

• XS: Chest 26 - 33 cm | Circumference 30 - 35 cm

• S: Chest 34 - 40 cm | Circumference 37 - 43 cm

• M: Chest 43 - 54 cm | Circumference 46 - 57 cm

If you are between two sizes, always go for the larger size.