Why the correct size doesn't depend on weight
Two dogs of the same weight might need different harness sizes because the fit is determined by chest shape, not the weight on the scale. That's why the key measurement is always the chest girth, taken at the widest point, just behind the front legs.
What you need to measure
- A flexible measuring tape (sewing, not rigid)
- Your dog standing, in a natural and relaxed position
- Ideally, another person to hold the dog while you measure
Step-by-step
- Place the tape around the chest, just behind the front legs, at the widest point.
- Run the tape without tightening: you should be able to slide two fingers between the tape and the dog's body.
- Note down the measurement in centimeters.
- Compare the result with the specific size chart for the model you are interested in, as each brand uses its own range. For example, the Line Harness 5.0 has its own numbered chart, different from other harnesses in the catalog.
What to do if your dog is between two sizes
If the measurement falls right on the border between two sizes, the general recommendation is to choose the larger size if your dog has a muscular build or tends to gain bulk, and the smaller size if they have a finer build or are still growing and have development ahead. If in doubt, write to us with the exact measurement, and we'll help you decide before purchasing.
How to check that the fit is correct once worn
- You should be able to slide two flat fingers between the harness and the dog's body at any point.
- The harness should not shift sideways or rotate when the dog walks.
- There should be no chafing or marks on the skin after a normal walk.
- The dog must be able to move its front legs with complete freedom, without the harness restricting its stride.
Consult the entire range in our harness collection if you want to compare sizes and models before deciding.
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