Wonder Walker harness sizing
Wonder Walker’s No-Pull Harness chart lists chest girths from 34.3cm to 121.9cm across 6 sizes. Runs further up than most, which matters for giant breeds. It also uses wide size bands, so a single size covers a lot of dogs and adjustment matters more.
The full chart
| Size | Chest girth | Weight guide | Buy |
|---|---|---|---|
| Toy | 34.3–45.7 cm | 4.1–6.8 kg | Shop Toy → |
| X-Small | 43.2–55.9 cm | 6.4–10 kg | Shop X-Small → |
| Small | 50.8–71.1 cm | 9.5–15.9 kg | Shop Small → |
| Medium | 63.5–83.8 cm | 15.9–29.5 kg | Shop Medium → |
| Large | 68.6–99.1 cm | 27.2–40.8 kg | Shop Large → |
| X-Large | 76.2–121.9 cm | 36.3 + kg | Shop X-Large → |
Taken from Wonder Walker’s own chart, checked 2026-10-04.
This chart is the No-Pull Harness. Wonder Walker make other harnesses, and a chart published for one is not automatically right for another — check the box before ordering a different model.
What Wonder Walker calls the same dog other brands would
Letter sizes do not travel between brands. For a chest measurement of 78cm, the finder recommends Wonder Walker Large using chest girth alone. Also covered by: Medium, X-Large. The same measurement gives these chart results:
- Julius-K9 — 1; also covered by 2
- Ruffwear — M
- PetSafe — Medium/Large; also covered by Large, Medium
- Kurgo — Large; also covered by X-Large
- Blue-9 — M/L; also covered by L, M
- Rabbitgoo — XL; also covered by L
- Puppia — XL
- PetSafe 3 in 1 — Medium; also covered by Large
- Dog Friendly Co — L
- PawSafe — L; also covered by M
- 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 Wonder Walker size and want it at every other brand, convert it directly — the tool opens on Wonder Walker and reads out every size that overlaps.
Where the size ranges meet
Wonder Walker has overlapping size bands. For example, Toy and X-Small both cover 43.2–45.7cm. 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.