A well-fitting dog harness should feel secure without restricting natural movement. Too loose, and your dog may be able to back out of it. Too tight, and the harness can rub or make walking uncomfortable. The safest approach is to measure your dog carefully, compare those measurements with the product size guide and check the fit again once the harness arrives.
What you need to measure
Use a soft measuring tape and measure while your dog is standing naturally. If you do not have a soft tape, wrap a piece of string around your dog and measure the string against a ruler.
1. Chest girth
Measure around the widest part of your dog’s ribcage, usually just behind the front legs. Keep the tape level and comfortably close to the body without pulling it tight. Chest girth is generally the most important harness measurement.
2. Neck or lower-neck circumference
Measure around the area where the harness will sit, which is often lower than the position of a traditional collar. Follow the individual product size guide rather than assuming a collar measurement will be identical.
3. Your dog’s weight and body shape
Weight can help confirm a size, but it should not replace physical measurements. Two dogs of the same weight can have very different proportions. Deep-chested breeds, broad-shouldered breeds and dogs between sizes may need extra attention to adjustment range.
How tight should a dog harness be?
Once fitted, you should generally be able to slide two fingers comfortably between the harness and your dog. Check around every contact point rather than testing only one strap. The harness should not rotate excessively, gape at the chest or pull into the armpits.
Watch your dog walk for several minutes. Their stride should remain natural, and the straps should stay clear of sensitive areas. Recheck the fit after the first few walks because straps can settle with use.
What if your dog is between sizes?
Check the adjustment range first. If both sizes could technically fit, consider your dog’s body shape and whether they are still growing. Avoid selecting a much larger harness purely to leave growing room, as a loose harness can reduce control and security.
Signs the fit needs adjusting
- The harness slides sideways or rotates during a walk.
- Your dog can place a leg through an opening or begin backing out.
- Straps sit directly in the armpits or cause rubbing.
- Your dog’s movement looks shortened or restricted.
- The harness leaves persistent pressure marks after normal use.
Choosing an everyday harness
Look for adjustable straps, reinforced stitching and hardware appropriate for regular walking. A structured harness can help distribute pressure across the body, while adjustment points allow a closer fit for different proportions.
The Maison Ruff adjustable leather dog harness is made from premium vegan-friendly PU leather and is available in multiple sizes and coordinated colours. If you want the complete look, the leather dog harness and lead set includes a matching harness, lead and poop bag holder.
Always check your dog’s harness before a walk for wear, damage or loose hardware. No general fitting guide replaces the product’s size chart or professional advice for a dog with a medical, mobility or behavioural concern.