1) Take the right measurement
- Get yourself a flexible measuring tape.
- Measure the chest circumference (just behind the front legs) at the end of an exhalation.
- Note the value and add a 2–3 cm comfort margin for ease.
2) Read the size guide
Refer to the manufacturer's size chart (e.g., XS 35–45 cm, S 45–55 cm, M 55–70 cm, L 70–85 cm, XL 85–100 cm). Choose the size where your measurement falls in the middle of the range to allow for adjustment.
3) Adjust correctly
- "Two-finger" test under each strap: neither too tight nor too loose.
- The sternal strap must remain horizontal (not rise up onto the throat).
- The shoulders must be free to maintain the range of motion.
4) Mistakes to avoid
- Buying "one size up" without measuring: risk of chafing and slipping.
- Ignoring morphology (broad chest, short back, growing puppy).
- Neglecting the dynamic test: walk for 2–3 minutes and check for the absence of irritation.
5) Quick checklist
- Chest circumference measured & noted.
- Size range selected with adjustment margin.
- "Two-finger" test OK, shoulders clear, sternal strap horizontal.
- Dynamic testing without redness or discomfort.
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