Hi folks, I put your post here since we're talking about Mobility and Hopping Around. You can always email us directly with other harness questions if you prefer.

Hang in there. About 99 percent of people who think their harness is too small find that it is not once they follow these instructions. I'm thinking it probably does fit. There is such a big variation in your original and second measurements and most dogs who wear a large are giant breeds and super large Labs, not Heelers. That would have to be one BIG heeler to wear a large!

OK so before you go through the return process, let's be certain it is indeed too small. MANY people believe the harness is too small when they receive it but that's only because Ruff Wear ships all harnesses with the straps pulled ALL the way in. About 99 percent of the time, the harness fits after people follow these steps:

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Extend all harness webbing straps completely out until the end of each strap reaches the corresponding buckle. Keep in mind that strap ends may be tucked inside the padded strap sleeves.

The entire length of the harness straps are actually tucked way into the padded strap sleeves. Sometimes loosening them takes some persistence, but unless you see the loose end of each strap, they haven't been pulled out all the way.

The harness has five adjustment points and it ships tightened to the smallest configuration. Please ensure all the straps extending from the three-point front support junction are also adjusted properly. They can each be extended for a looser fit.

The chest and belly straps can also be lengthened. The harness should be snug, but not constricting.

Let us know if this works. I am also happy to walk you through the adjustment process on the phone too, just email me to set up a time to chat.