What size harness does a French Bulldog need?
The breed standard puts a French Bulldog at 8–13kg (18–29lb). Weight alone settles the size at 1 of the 5 brands. 2 brands size by girth only and are left blank rather than guessed.
What that weight means at each brand
| Brand | Size | What it means |
|---|---|---|
| Julius-K9 | Mini | Every French Bulldog in the breed's weight range falls in Julius-K9 Mini. |
| Ruffwear | measure | Ruffwear sizes by chest girth only and publishes no weight guidance, so a French Bulldog's weight cannot be converted to one of their sizes. Measure the chest and the tool above will answer it exactly. |
| PetSafe | Small or Small/Medium or Medium | The breed's weight range spans 3 PetSafe sizes (Small, Small/Medium, Medium), so weight alone cannot pick between them. The chest measurement decides. |
| Kurgo | Small or Medium | The breed's weight range spans 2 Kurgo sizes (Small, Medium), so weight alone cannot pick between them. The chest measurement decides. |
| Blue-9 | measure | Blue-9 sizes by chest girth only and publishes no weight guidance, so a French Bulldog's weight cannot be converted to one of their sizes. Measure the chest and the tool above will answer it exactly. |
Blank entries are deliberate. Ruffwear and Blue-9 publish no weight guidance to convert, and printing a size anyway would be a guess dressed as an answer.
Now measure, and get the exact size
A breed weight range covers both sexes and every build, which is why it spans more than one size almost everywhere. One measurement replaces all of it. Barrel-chested and short-backed. Girth runs large for the weight, so weight-based guidance under-sizes this breed more often than any other.
Measure right around the deepest part of the ribcage, just behind the front legs.
6 size ranges overlap here. The marker shows where your dog falls inside each one — nearer the middle means more adjustment room either way.
How to measure a French Bulldog
Take a soft tape right around the deepest part of the ribcage, just behind the front legs. Keep it snug against the coat rather than pulled tight — you should be able to slide two fingers under it. That single number, the chest girth, is what every brand on this page sizes by. Weight is only ever a tie-breaker.
Why the answer is a range, not a number
Every page that hands you one size for a French Bulldog is hiding the same problem: the breed standard covers a 63% spread in weight between the lightest and heaviest adults, and girth varies more than weight does. Two French Bulldogs on the same scale reading can be a size apart. The honest answer is the shortlist above plus the tape.
Other medium breeds
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- What size harness does a English Springer Spaniel need?
- What size harness does a Brittany need?
- What size harness does a Cocker Spaniel need?
Weight range from the breed standard, read 2026-08-25. Sizes come from each manufacturer’s own published chart — nothing on this page is estimated or averaged between brands.