For UK dog owners

The right size, first time

Tell us your dog's breed, and its chest or weight if you know it. We'll show the harness size that fits in each brand, so you don't have to compare charts or send anything back.

How it works

  1. Pick your breedWe know the typical chest and weight for each breed.
  2. Add a measurementA quick chest measurement turns a likely range into an exact size.
  3. Get your size in every brandMatched to each brand's own chart, with the source shown.

Harness guides by breed

In-depth guides: how each breed is built, how to measure, sizes by brand, puppy sizing and fit checks.

New to measuring?

Our step-by-step guide covers chest, neck, back, height and weight, with tips for puppies, fluffy coats and wriggly dogs.

How to measure your dog

What we size

Brands covered so far: Julius-K9, Ruffwear, Bailey & Coco. Every size comes from the brand's published chart, and every page shows its sources and the date we last checked them.