Puppy Harnesses: How to Measure the Right Size

Sizing charts come from the manufacturers’ own pages, checked on 2026-10-25. This is not a hands-on fitting review, and no harness has been tested or fitted by us. Leashes are not covered yet.

This guide focuses on products and manufacturer information for the US market. Product specifications and the recall search described here reflect the sources checked as of the review date; they do not guarantee that a product has never been recalled or that it is suitable for every puppy.

What you need to decide

A harness that is too loose or too tight is a common first-week problem. The fastest way to choose is to measure your puppy and compare that measurement with the chart for the brand you are buying.

Measure before you compare

Girth. Both Ruffwear charts use girth: measure around the widest part of the rib cage, as the fit guide says.
Chest and neck. The Kurgo chart uses neck and chest. Measure both as the brand’s measuring guide shows.
Between sizes. Ruffwear says to choose the larger size. The Kurgo page we read gives no between-sizes rule, so the guide does not invent one.
Fit. Kurgo says the fit should be snug but not restrictive. Check the fit on your puppy before the first walk.

Compare the documented sizing

Three harnesses from two manufacturers. Each row shows that brand’s own chart. Sizes are not equivalent across brands. On a small screen, scroll the table sideways.

Scroll sideways to see every column.

Harness	Sizing method	Sizes and measurements (inches)	Weight shown	Between sizes	Our status
Ruffwear Hi & Light Lightweight Dog Harness	Girth only	XXXS 9–13; XXS 13–17; XS 17–22; S 22–27; M 27–32; L/XL 32–42	Not stated	Choose the bigger size	Matches manufacturer page (checked 2026-10-25)
Ruffwear Front Range Harness	Girth only	XXS 13–17; XS 17–22; S 22–27; M 27–32; L/XL 32–42	Not stated	Choose the larger size	Matches manufacturer page (checked 2026-10-25)
Kurgo Tru-Fit Smart Dog Walking Harness	Neck and chest, with a dog-weight column	X-Small: neck 9–13, chest 12–18. Small: neck 12–20, chest 16–22. Medium: neck 16–25, chest 18–28. Large: neck 18–30, chest 24–34. X-Large: neck 24–35, chest 28–44.	X-Small 5–10 lb; Small 10–25 lb; Medium 25–50 lb; Large 50–80 lb; X-Large 80–110 lb	Not stated	Matches manufacturer page (checked 2026-10-25)

Weight is shown only where the manufacturer’s chart gives it. Prices are not shown.

Options by need

No harness here is named the best. Each one measures differently, so the right choice depends on your puppy’s measurements.

Very small puppies

The Ruffwear Hi & Light starts at XXXS, which covers a girth of 9 to 13 inches. Check that your puppy’s girth falls in that range before you buy.
Girth-based sizing

Both Ruffwear harnesses are sized by girth alone. Measure once and use the same measurement for either.
Neck and chest sizing

The Kurgo harness is sized by neck and chest. Measure both, and use the weight column only as a rough cross-check.

Limits and what to check before you buy

We have not fitted or tested any of these harnesses. Everything here comes from the manufacturers’ pages.
Kurgo (manual, quick-release version 4-15): hand wash with cold water and mild soap, then hang to air-dry; do not machine-dry. The manual says “This product has not been crash tested and cannot guarantee protection from injury in the case of an accident.” It also says not to use the chest D-ring or leash hitch to secure a dog in a vehicle. Kurgo’s product page describes the Tru-Fit Smart Dog Walking Harness as having quick-release buckles, and this manual is the quick-release version. Kurgo also lists a separate nesting-buckle version with its own manual; this guide does not cover that version.
Ruffwear (product page and adjustment guide): four adjustment points. Extend all the straps first, then tighten them. Materials: a polyester shell with a foam pad, and an aluminium V-ring at the back. Care: hand wash with mild detergent, then air-dry.
No Ruffwear instruction manual was found. The Ruffwear product page and adjustment guide are the only Ruffwear documents we read.
Ruffwear does not state a weight range on its fit guides. Use girth alone for those harnesses.
Sizes differ between brands. Measure again if you switch brands.
Check the fit on your puppy before the first walk. The only fit wording on the manufacturers’ pages we read is Kurgo’s “snug but not restrictive.” We did not find a fit test on any of these pages.

Questions readers ask

Can I pick a harness by weight alone?

Kurgo’s chart includes a weight column, but the page does not say weight decides the size. Measure first. Use weight only as a cross-check.

If my puppy falls between two sizes, which should I choose?

Ruffwear says to choose the larger size. The Kurgo page we read gives no rule for between sizes, so check with the brand before you buy.

Is the Kurgo walking harness crash-tested?

Kurgo’s Safe Again program replaces car harnesses after a crash with its crash-tested car harnesses: the Enhanced Strength Tru-Fit Dog Car Harness and the Impact Dog Car Harness. The Tru-Fit Smart walking harness is not named in that program. Its instruction manual says the product “has not been crash tested”.

Are there safety recalls for these harnesses?

We searched the US Consumer Product Safety Commission’s recall listing on 2026-10-26 by manufacturer and product name (Ruffwear, Front Range, Hi & Light, Kurgo, Tru-Fit Smart) and found no matching recall. The search is name-based and leaves out archived items, so a search with no match does not prove that no recall exists. Check cpsc.gov again before you buy.

Sources, dates, and method

Each size chart comes from the manufacturer’s own product page, read on 2026-10-25. Retailer listings were used only to find products. Prices and ratings were not used.

Puppy Harnesses Buying Guide