Blue-9 harness sizing
Blue-9’s Balance Harness chart lists chest girths from 34cm to 110.5cm across 5 sizes. Uses wide size bands, so a single size covers a lot of dogs and adjustment matters more.
The full chart
| Size | Chest girth | Buy |
|---|---|---|
| XS | 34–45.5 cm | Shop XS → |
| S | 44.5–64.5 cm | Shop S → |
| M | 53–81 cm | Shop M → |
| M/L | 61–90 cm | Shop M/L → |
| L | 73.5–110.5 cm | Shop L → |
Taken from Blue-9’s own chart, checked 2026-08-19.
This chart is the Balance Harness. Blue-9 make other harnesses, and a chart published for one is not automatically right for another — check the box before ordering a different model.
What Blue-9 calls the same dog other brands would
Letter sizes do not travel between brands. For a chest measurement of 72cm, the finder recommends Blue-9 M/L using chest girth alone. Also covered by: M. The same measurement gives these chart results:
- Julius-K9 — 1; also covered by 0, 2
- Ruffwear — M
- PetSafe — Medium/Large; also covered by Medium, Large
- Kurgo — Large; also covered by X-Large
- Rabbitgoo — XL; also covered by L
- Puppia — XL; also covered by L
- PetSafe 3 in 1 — Medium
- Dog Friendly Co — L; also covered by M
- PawSafe — M; also covered by L
- Wonder Walker — Medium; also covered by Large
- Top Paw — Large
These recommendations use chest girth alone. The size finder also considers published weight guidance when you supply weight. If you already know your dog’s Blue-9 size and want it at every other brand, convert it directly — the tool opens on Blue-9 and reads out every size that overlaps.
Where the size ranges meet
Blue-9 has overlapping size bands. For example, XS and S both cover 44.5–45.5cm. The finder recommends the most central match by chest girth and keeps the other covering sizes visible; published weight guidance can help choose when weight is supplied.
Near the bottom of a size’s range, the straps run close to their tightest; near the top there is little adjustment left. The size finder shows that position and every covering alternative.