The chart gets you close. A short walk confirms the fit.
Weight is the quickest starting point for most dogs. If your dog sits at a size boundary, is still growing, or has an unusually broad or compact build, use the chest range as a quick secondary check.
Stop using it and reassess the fit if you notice persistent rubbing, restricted movement or damaged hardware.
- A stable fit should
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Keep the front panel centered on the chest
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Leave the shoulder area free to move
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Keep straps flat rather than folded
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Stay in place under light leash tension
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Allow normal breathing, standing and walking