Quick answer

To measure your dog for a harness, you need two key measurements: the neck circumference and the widest part of the chest (girth). Use a flexible measuring tape, keep it snug but not tight, and always check the brand's size chart before ordering.

What You'll Need

Before you start, grab a flexible measuring tape (the kind used for sewing). If you don't have one, a piece of string and a ruler will work. You'll also need a notepad to write down the numbers and your dog's cooperation—treats help a lot. Avoid using a metal tape measure; it's stiff and uncomfortable for your dog.

When to Measure

Measure your dog while they are standing in a natural, relaxed position. Don't measure when they are sitting or lying down, as that can distort the numbers. If your dog is wiggly, take the measurement a couple of times to ensure consistency. For puppies, remember they grow quickly, so re-measure every few weeks.

Step-by-Step Measuring Guide

  1. Measure the neck: Wrap the measuring tape around the base of your dog's neck, where the collar normally sits. Keep two fingers between the tape and your dog's neck to allow for comfort. Write down the measurement. Common mistake: measuring too high on the neck. The harness should sit at the base, not the throat.
  2. Measure the chest girth: Find the widest part of your dog's chest, usually right behind the front legs. Wrap the tape around this area, keeping it snug but not tight. Make sure the tape lies flat and doesn't twist. Checkpoint: the tape should slide easily but not slip down. If it moves, you're too loose.
  3. Check the brand's size chart: Every harness brand has its own sizing. Compare your dog's measurements to the specific size chart for the harness you want. If your dog falls between sizes, choose the larger size for comfort. Verdict: a well-fitted harness should allow two fingers to slide under the straps anywhere. If you can fit more, it's too loose.

Product facts

  • Muse™ harness: The Muse harness is modular, low-profile, and ready for whatever the day throws at you. A modular harness like the Muse lets you adjust the fit for different activities, but you still need accurate measurements to choose the right size option.