Small dog harness sizing: fit it by weight, then check the chest

Getting a small dog harness right comes down to two numbers: how much your dog weighs, and how big around the chest is. EcoBark sizes its step-in and over-the-head mesh harnesses by weight, in ranges built for teacup and small dogs, and getting that first number close saves you a return.

Start with the weight range

The Step In Dog Harness runs XXXS for 2 to 3 pound dogs, XXS for 4 to 5 pounds, XS for 5 to 6 pounds, Small for 7 to 10 pounds, Medium for 13 to 16 pounds, Large for 17 to 19 pounds, and XL for 20 to 26 pounds. The over-the-head mesh harness, listed as a vest halter, uses its own scale: X-Small for 4 to 5 pounds, Small for 6 to 10 pounds, Medium for 11 to 17 pounds, Large for 18 to 27 pounds, X-Large for 28 to 47 pounds, and XX-Large for 48 to 65 pounds. Two styles, two charts, and letters that do not line up between them, so confirm which style you are ordering before matching a letter to a number.

Measure the chest

A scale gets you into the right neighborhood, but two 8 pound dogs can have different chests depending on the breed. Wrap a soft tape measure around the ribs, right behind the front legs, and write that number down next to your dog's weight. Compare both numbers to the size chart on the product page rather than picking a size by name alone. If the chest measurement lands between two sizes, the weight range is the tiebreaker.

Once the harness is on, check that you can slide two fingers under the strap at the chest and that it sits flat without twisting. If something looks wrong, stop and call your veterinarian.

If your dog is still growing

A puppy near the top of one size and the bottom of the next is common enough. Re-measure the chest every few weeks and compare it to the chart again rather than assuming the first size will still fit next month. Both harness styles fasten with a hook and loop strap or a buckle, not a fixed frame, so there is some room to adjust within a size before you need to size up.

What changes between the styles

The Step In Dog Harness has your dog stand inside the harness while you bring the straps up and close them over the back with a hook and loop strap. The over-the-head harness goes on the other direction: it slips over the head first, then the belly strap closes underneath with a buckle. Both styles use a D-ring on the back for the leash and come in a color list long enough to match a leash without much trouble, from Cherry Red to Camouflage to Buffalo Plaid.

Buying harness and leash together

EcoBark also sells a Harness and Leash Combo, sized as XS, Small, Medium, Large, X-Large, and XX-Large rather than by the weight charts above, which is worth a look if you would rather place one order instead of matching a harness color to a leash color separately. The leash on the combo clips to the same D-ring on the back of the harness.

In the Gear aisle

Browse the full small dog harness lineup, or read more about the maker on the EcoBark Pet Supplies page. EcoBark ships these harnesses directly to you through Shopify Collective, with its own tracking, while our treats ship separately from our kitchen in Malvern, Pennsylvania.

Once the harness fits, the fitting itself goes faster with something small enough to hold a small dog's attention. A freeze-dried treat works for that, one piece at a time while you check the buckle.

Questions

How do I know if my dog is between sizes?

Compare the chest measurement to the size chart first. If your dog's weight and chest fall in different size rows, go with the one that matches the chest, since that is what the strap actually closes around.

Do step-in and over-the-head harnesses use the same size chart?

No. The Step In Dog Harness sizes run XXXS through XL, and the over-the-head mesh harness runs X-Small through XX-Large, with different weight ranges attached to similar sounding letters. Check the chart on the specific product before you order.

What if the harness still isn't sitting right after I check the fit?

Recheck the chest measurement and the size chart, and try the next size up or down. A harness that still doesn't sit flat after that usually means the wrong size, not the wrong dog.