The range spans 2 Ruffwear sizes. Which one you need depends on where your dog sits inside Julius-K9 “0” — which is exactly what a measurement settles.
FurPick / Convert
The dog harness size conversion chart
Every brand’s sizes, lined up against each other on one scale. A Julius-K9 “1” is a Ruffwear “M”. Here is all of it, sourced and dated.
Know one brand’s size? Convert it
Julius-K9 0 fits
58–76 cm
PetSafe Medium covers this whole range on its own — a straight swap.
The range spans 3 Kurgo sizes. Which one you need depends on where your dog sits inside Julius-K9 “0” — which is exactly what a measurement settles.
Blue-9 M covers this whole range on its own — a straight swap.
L and XL both cover this whole range. L is the closer fit at 43–85cm; the larger one leaves more slack to take in.
Puppia XL covers this whole range on its own — a straight swap.
A solid chip covers the whole range on its own — a straight swap. A percentage is how much of the range that size covers, so anything under 100% depends on where your dog sits inside it. Measure once and the question disappears.
Every size, on one scale
| Chest girth | Julius-K9 | Ruffwear | PetSafe | Kurgo | Blue-9 | Rabbitgoo | Puppia |
|---|---|---|---|---|---|---|---|
| 30 cm | Baby 1 | XXXS | — | X-Small | — | XS | — |
| 32 cm | Petite | ||||||
| 34 cm | XXS | XS | S | ||||
| 36 cm | Baby 2 | ||||||
| 38 cm | |||||||
| 40 cm | Petite/Small | ||||||
| 42 cm | S | ||||||
| 44 cm | Mini-Mini | XS | Small | Small | M | ||
| 46 cm | S | ||||||
| 48 cm | |||||||
| 50 cm | M | ||||||
| 52 cm | Mini | Small/Medium | |||||
| 54 cm | Medium | L | |||||
| 56 cm | |||||||
| 58 cm | S | ||||||
| 60 cm | M | L | |||||
| 62 cm | Medium | ||||||
| 64 cm | 0 | ||||||
| 66 cm | Large | XL | |||||
| 68 cm | |||||||
| 70 cm | M | XL | |||||
| 72 cm | 1 | Medium/Large | M/L | ||||
| 74 cm | |||||||
| 76 cm | |||||||
| 78 cm | |||||||
| 80 cm | 2 | Large | |||||
| 82 cm | L | X-Large | — | ||||
| 84 cm | L | ||||||
| 86 cm | |||||||
| 88 cm | |||||||
| 90 cm | 3 | ||||||
| 92 cm | XL | ||||||
| 94 cm | Extra Large | ||||||
| 96 cm | |||||||
| 98 cm | — | ||||||
| 100 cm |
How to use this
Find your dog’s chest girth in the left column and read across. Every cell is that brand’s own size label for a dog of that measurement. A dash means the brand does not make a harness that size.
Where a brand’s sizes overlap — and they all overlap, deliberately, so the adjustment straps have somewhere to go — the cell names the size your dog sits most centrally in. If you are between two, the sizing tool shows both and where you fall inside each.
Where these numbers come from
- Julius-K9 — IDC Powerharness, 29–138 cm · source · checked 2026-08-19
- Ruffwear — Harness (girth sizing), 23–107 cm · source · checked 2026-08-19
- PetSafe — Easy Walk Harness, 30.5–124.5 cm · source · checked 2026-08-19
- Kurgo — Tru-Fit Smart Harness, 30–112 cm · source · checked 2026-08-19
- Blue-9 — Balance Harness, 34–110.5 cm · source · checked 2026-08-19
- Rabbitgoo — ControlPro No-Pull Harness, 29.5–96.5 cm · source · checked 2026-08-28
- Puppia — RiteFit Harness, 33–80 cm · source · checked 2026-08-28
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