Fit first · airway-safe
The Fit Guide
A barrel chest and a short neck are exactly why standard harnesses fail on Frenchies, Pugs, Bostons and Bulldogs. Here's how to measure yours in two minutes and land the right size the first time — no guessing, no returns.
Measure in 2 minutes:
① Wrap a soft tape around the widest part of the chest, just behind the front legs.
② If weight and chest disagree, trust the chest.
③ Two fingers should slide under the strap — snug, not tight. Between sizes? Size up.
① Wrap a soft tape around the widest part of the chest, just behind the front legs.
② If weight and chest disagree, trust the chest.
③ Two fingers should slide under the strap — snug, not tight. Between sizes? Size up.
| Size | Range | Chest girth | Weight (guide) | Best for |
|---|---|---|---|---|
| S | Clasp | 38.3–43.3 cm | 4.5–8.0 kg | Adult Shih Tzus, Pekingese, small Bostons |
| M | Clasp | 43.4–49.0 cm | 6.5–10.5 kg | Adult Shih Tzus, Pekingese, Bostons |
| L | Clasp | 49.1–55.4 cm | 9.0–13.0 kg | Growing Frenchies, adult Pugs, larger Bostons |
| XL | Clasp | 55.5–62.7 cm | 11.5–18.0 kg | Small adult Frenchies, broader Pugs |
| 2XL | Belka | 62.8–70.1 cm | 16.5–24.0 kg | Broad adult Frenchies, English Bulldogs |
| 3XL | Belka | 70.2–78.9 cm | 22.0–31.0 kg | Larger English Bulldogs |
| 4XL | Belka | 79.0–92.0 cm | 28.0–48.0+ kg | Boxers |
Right around the 62.7 cm handover from Clasp XL to Belka 2XL? Message us your dog's exact chest measurement and we'll confirm XL vs 2XL before you order.
The Clasp range (S–XL) and the Belka range (2XL–4XL) both fit by chest girth, with weight as a rough guide; past 62.7 cm you're into Belka 2XL. Breed labels are a rough guide; puppies and growing dogs change fast, so always measure. We go by the tape, not the breed. (Based on Curli's official 2025 size chart.)