How to Measure Your Dog for a Harness: A Step-by-Step Guide
By Muttluks | Published: 2026-08-31
Category: How-to Guides
Learn how to measure your dog for a harness with our step-by-step guide. Get accurate chest and neck measurements for a perfect fit.
A well-fitted harness is essential for your dog's comfort and safety during walks, hikes, or travel. Unlike collars, harnesses distribute pressure evenly across the chest and back, reducing strain on the neck. But to get those benefits, the harness must fit correctly. Too loose, and your dog might slip out; too tight, and it can chafe or restrict movement.
Measuring your dog for a harness is a straightforward process that requires just a flexible measuring tape and a few minutes. In this guide, we'll walk you through the steps to get accurate measurements for chest, neck, and sometimes length, so you can choose the right size from any brand, including Muttluks.
What You Need to Measure
Before you start, gather a flexible measuring tape (the kind used for sewing), a piece of string or ribbon as a backup, and a pen and paper to note the measurements. Have your dog stand in a relaxed, natural position—not sitting or lying down—as this ensures the measurements reflect their true size.
You'll need two key measurements: the chest girth and the neck girth. Some harness styles also require measuring the length from the base of the neck to the base of the tail, but this is less common. Always refer to the specific brand's sizing chart, as different designs may have different measuring points.
- Use a flexible tape measure; a rigid ruler won't conform to your dog's body.
- Measure twice to ensure accuracy, especially if your dog is wiggly.
Step-by-Step Measuring Instructions
**Chest Girth:** Wrap the tape measure around the widest part of your dog's chest, just behind the front legs. This is typically the deepest part of the ribcage. Keep the tape snug but not tight—you should be able to slide two fingers underneath. Record the measurement in inches or centimeters.
**Neck Girth:** Place the tape measure around the base of the neck, where a collar would normally sit. Again, keep it snug but comfortable, allowing two fingers to fit. This measurement is important for harnesses that have a neck opening.
**Length (optional):** For some harness styles, measure from the base of the neck (between the shoulder blades) to the base of the tail. This helps ensure the harness doesn't sit too far back or too far forward.
- If your dog is between sizes, choose the larger size for comfort, especially if they are still growing.
- For puppies, re-measure every few weeks as they grow quickly.
How to Use the Measurements with a Sizing Chart
Once you have your dog's chest and neck measurements, compare them to the brand's sizing chart. Most charts list sizes (e.g., XS, S, M, L) with corresponding chest and neck ranges. For example, Muttluks' MuTTravel Viking Safety Harness comes in multiple sizes, and its chart specifies chest girth ranges for each size.
If your dog's measurements fall into different sizes for chest and neck, prioritize the chest measurement, as it's the most critical for fit and security. A harness that's too tight around the chest can restrict breathing, while one that's too loose may slip over the head.
Remember that every brand has its own sizing, so always check the specific product's chart, not just the size label. For instance, the MuTTravel ViziNek might have a different fit than the MutTTravel Viking Safety Harness, even if your dog wears the same size in both.

- Print the sizing chart and mark your dog's measurements to visualize the fit.
- If in doubt, contact the manufacturer's customer service for guidance.
Trying On the Harness and Adjusting for a Perfect Fit
After you receive the harness, try it on your dog before heading out. Put it on loosely, then adjust the straps so it sits comfortably. The harness should be snug but allow you to slide two fingers under any strap. Check that the chest piece is centered on the sternum, not pressing on the throat or restricting the shoulders.
Watch your dog's movement: they should be able to walk, trot, and turn their head freely. If the harness shifts or rubs, re-adjust the straps. Some harnesses, like the MuTTravel Ready Sport Harness, have multiple adjustment points for a customized fit.
Over time, harnesses can stretch or your dog's weight may change, so re-check the fit every few months. A well-fitted harness not only keeps your dog secure but also prevents chafing and discomfort.
- Always fasten all buckles and clips securely before walks.
- If your dog is between sizes, consider a harness with more adjustment range.
Measuring your dog for a harness is a simple yet crucial step to ensure their comfort and safety. By following this step-by-step guide, you'll have accurate measurements to choose the right size from any brand. Remember to always check the specific sizing chart and adjust the harness properly for a snug, secure fit. Happy walking!



