How to choose the right harness size
Using a soft measuring tape, measure snugly:
Your dog's chest at its widest point — just behind the front legs, around the ribcage, a little back from the armpit (about 2–4 finger-widths, depending on your dog's size).
Find the matching range in the size chart. Our sizes are designed to overlap slightly, so your dog will always fall clearly within a size. If your measurements land in an overlap, choose the size that leaves room to adjust in both directions.
The exception is puppies and adolescent dogs: for them, size up to allow the most room to grow.