Measure the circumference of your dog's neck and add 2 extra centimeters to the result obtained.
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XS: 21.5 - 27.5 cm (width 2.5 cm)
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S: 26.5 - 32 cm (width 2.5 cm)
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M: 31.5 - 37 cm (width 2.5 cm)
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L: 37.5 - 43.5 cm (width 3 cm)
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L2: 42.5 - 48.5 cm (width 3 cm)
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XL: 47.5 - 53.5 cm (width 3 cm)