To choose a dog harness size, measure your dog instead of relying only on breed, age or weight. Use a soft measuring tape, follow the exact points in the brand's size chart and check the final fit again once the harness is on your dog.
After measuring, use our complete dog harness fit guide to check whether the harness actually sits correctly.
What do you need to measure your dog?
A flexible measuring tape works best. If you do not have one, use a piece of string and measure that against a ruler. Let your dog stand naturally on a flat surface.
Which measurements should you take?
Always follow the size chart for the specific harness you want to buy. Different harness designs can ask for different measurements. Do not assume that a size M from one brand matches a size M from another.
How tight should the measuring tape be?
Keep it close to the body without pulling it tight into the coat or skin. Thick fur can change the measurement, so keep the tape consistent and measure more than once if needed.
What if your dog falls between two sizes?
Look at the adjustment range and your dog's build rather than automatically choosing the larger size. A harness that is much too large can rotate or shift, while one that is too small can sit too close to sensitive areas.
Should you choose a size based on breed or weight?
Breed and weight can give context, but they are not precise enough on their own. Two dogs of the same breed and weight can have different body proportions.
How do you check the size after the harness arrives?
Adjust all relevant straps and then watch your dog stand, walk and turn. The harness should stay reasonably stable without pressing into the body or repeatedly sliding into the armpits.
Use our Size Guide and explore our Dog Harnesses. The UNBORINGBYPIP harness has four adjustment points and 2 leash attachment points (front and back).
Frequently asked questions
Can I choose a harness size by weight alone?
No. Weight is only a rough indication. Use the measurements in the specific size chart.
How many times should I measure my dog?
Measuring twice is a good way to catch simple mistakes, especially if your dog moves during the first measurement.
Should I measure over thick fur?
Measure consistently and keep the tape close to the body without compressing the coat excessively.
What if my dog is between sizes?
Compare the adjustment ranges and your dog's proportions. Do not automatically size up.
Do puppies need to be measured more often?
Yes. Puppies can change quickly during growth, so remeasure regularly.
Does the right measurement guarantee a perfect fit?
No. Measuring helps you choose a starting size, but the final fit should always be checked on the dog while standing and moving.