What Size Harness Does My Dog Need? (Fit Guide 2026)
Naja YehiaWhat Size Harness Does My Dog Need? (Complete Fit Guide 2026)
Choosing the correct harness size is one of the most important decisions for your dog's comfort, safety, and walking control. A harness that is too tight can cause rubbing and restriction, while one that is too loose can slip or reduce effectiveness.
This guide explains exactly how to measure your dog, how harness sizing works, and how to make sure you choose the right fit.
Step 1: Measure Your Dog Correctly
You will need a soft measuring tape.
- Chest girth: Measure around the widest part of your dog's ribcage, just behind the front legs.
- Neck (if required): Measure the base of the neck where a harness would sit, not high like a collar.
Chest measurement is usually the most important sizing reference.
Dog Love Boutique Tip: Always measure snug but not tight. You should be able to slide two fingers comfortably under the final fitted harness.
Step 2: Understand Harness Sizing Charts
Each brand sizes differently. A Medium in one brand may fit differently in another. Always check the chest measurement range listed in the product details.
If your dog falls between sizes, choose the size that allows the most adjustability around the chest.
DogLove Pro Harness size chart
This is the chart for the harness we stock and fit in the salon. Use it as a working example of how chest girth ranges translate into sizes.
| Size | Chest girth | Typically fits | Price |
| XS | 33 to 43 cm | Puppies, toy poodles, chihuahuas | $59.95 |
| S | 43 to 56 cm | French bulldogs, pugs, Jack Russells, cavoodles | $61.95 |
| M | 56 to 69 cm | Staffies, border collies, spoodles | $64.95 |
| L | 69 to 81 cm | Labradors, golden retrievers, groodles | $69.95 |
| XL | 81 to 107 cm | German shepherds, rottweilers | $74.95 |
If your dog lands between two sizes, take the larger one. Every size adjusts at four points, so there is room to bring it in.
How Should a Harness Fit?
A properly fitted harness should:
- Fit snugly without restricting movement
- Not rub under the front legs
- Stay centred on the chest
- Not twist during walks
If your dog can back out of it, the fit is too loose. That is the most common reason a harness fails, and it is fixable. Our guide on how to stop a dog backing out of its harness covers the five point check, the harness feature that actually holds a determined escape artist, and what to do the moment it starts.
Common Sizing Mistakes
- Guessing instead of measuring
- Choosing based on weight alone
- Not adjusting all straps after purchase
- Leaving growth room for puppies, which usually causes slipping
- Not re checking the fit after a groom, since a coat coming off can leave a surprising amount of slack
Small, Medium or Large? What It Really Means
Harness sizes are based on chest girth ranges, not breed labels. For example, a slim Border Collie and a stocky Staffy may both wear different sizes depending on build.
Always rely on measurements over assumptions.
You can shop the harness this chart belongs to, or browse the wider range:
Shop the DogLove Pro Harness Browse adjustable dog harnesses
Shipped from our Tranmere salon. Order before 2pm AEST and it goes out the same day, with free local pickup in Adelaide. If the size is not right, post it back or drop it into the salon for a swap. Still unsure, text a photo of your dog to +614 24 444 420 and we will tell you what fits.
Still Not Sure? Consider Control Needs
If your dog pulls strongly, sizing matters even more. A secure, properly fitted front clip harness improves control and reduces the chance of an escape.
Learn more in our detailed guide:
Best No Pull Dog Harness for Strong and Reactive Dogs
Still Deciding Between a Harness and a Collar?
Sizing only matters once you have settled on the gear itself. Our guide on harness vs collar safety explains where the pressure lands with each one, why it matters most for small and flat faced breeds, and when a collar is still perfectly fine.
Final Thoughts
The right harness size ensures comfort, safety, and better walking behaviour. Take the time to measure properly. It makes a significant difference in daily walks.