Buy a puppy harness based on girth adjustment ranges. Compare manufacturers to find sizes that accommodate growth stages rather than requiring replacement after a few weeks.
10 October 2026 · 5 min
The right harness size at every brand, from one measurement
Type your dog’s chest girth. We read it against 11 makers’ own size charts — sourced, dated, never guessed — and show where your dog sits inside each size.
Around the chest, just behind the front legs. Measuring guide.
Type the chest girth and the size appears for all 12 harnesses — Julius-K9 · Ruffwear · PetSafe · Kurgo · Blue-9 · Rabbitgoo · Puppia · PetSafe 3 in 1 · Dog Friendly Co · PawSafe · Wonder Walker · Top Paw — with where your dog sits inside each size.
Before you order — the two-finger rule · full measuring guide
- Measure the deepest part of the ribcage, just behind the front legs, with the dog standing.
- Two fingers should slide flat under any strap. A whole hand means it is loose enough to reverse out of.
- Snug against the coat, not pulled tight through it — and re-check after a groom.
Ranges are transcribed from each manufacturer’s own chart. See the full conversion chart or how we check these numbers.
No tape to hand? Start from your breed · Already know one brand’s size? Convert it · How to measure
How the number works
Step 1
Measure once
The deepest part of the ribcage, just behind the front legs. That single number is what every brand sizes by.
Step 2
Get your number
Your dog’s girth in centimetres, which is the only figure that means the same thing at every manufacturer.
Step 3
Read it anywhere
11 brands, 12 harness charts, 70 sizes — each transcribed from the maker’s own chart.
The conversion nobody else publishes
A Julius-K9 “1” is a Ruffwear “M”. Every brand’s sizes, lined up against each other on one scale, so you can see exactly where they disagree — including the sizes with no clean equivalent anywhere else.
See the full chartOther ways in
Start from your breed
60 breeds, sized from each manufacturer’s own chart — for when you have not got a tape to hand.
Browse the brand charts
11 brands, 70 sizes, each with the page it came from and the date it was checked.
How we check the numbers
What we source, what we refuse to guess, and why 6 harnesses are left blank on breed pages.
From the magazine see all
What decides whether a harness works is whether it fits, and every brand sizes differently. Four steps to the right harness and size for your dog, with twelve makers' charts side by side.
4 October 2026 · 4 min
For small dogs, most harnesses are not made small enough: below 29cm of chest only one of twelve fits, by 35cm ten do. Who starts where, and how to size toy breeds and Miniature Dachshunds.
28 September 2026 · 4 min
A harness that does not fit is a harness a dog can back out of. If your measurement lands on the edge of a range, take the size that leaves adjustment in hand rather than the one that only just closes. Julius-K9 · Ruffwear · PetSafe · Kurgo · Blue-9 · Rabbitgoo · Puppia · PetSafe 3 in 1 · Dog Friendly Co · PawSafe · Wonder Walker · Top Paw