Dog Harness Sizing Guide: Chest, Neck and Fit Checks

Sizes vary between brands, so a size M from one maker may fit very differently from a size M from another. The most reliable way to pick a size is to measure your dog and compare those numbers with the size chart.

The two measurements that matter most

Chest girth is the main measurement. Wrap a soft tape around the widest part of the chest, just behind the front legs.

Neck girth helps you check the upper strap. Measure where a collar would sit.

If your dog's measurements fall between two sizes, choose the size that matches the chest and rely on the adjustable straps for the rest.

How the fit should feel

A well-fitted harness sits flat against the body and stays in place when your dog walks, sits or shakes. Use the two-finger check:

• Slide two fingers under each strap. Snug, not squeezed.
• Check that the chest piece doesn't ride up toward the throat.
• Make sure the back D-ring sits in the middle of the back, not off to one side.

Signs the harness is too big

• It slides toward the shoulders or the neck
• You can fit more than two fingers under a strap
• Your dog backs out of it when you lift the leash

Signs the harness is too small

• Red marks or rubbing behind the front legs
• Straps that you can't loosen any further
• Your dog pulls away or seems uncomfortable when you put it on

Adjusting after delivery

Give the harness a few walks before you decide. Straps settle, and small adjustments often solve minor fit issues. If the size still feels wrong, contact us so we can help.

Sizes from S to 2XL

FurFam harnesses come in sizes S to 2XL. Each harness is padded, with reflective piping and adjustable straps, and it's made for your dog with their name on the side label.

Ready to measure? Take your dog's chest and neck numbers, check the size guide, and pick the size that matches.