Thanks for asking, just curious... did you adjust the three front chest straps? The Ruff Wear Webmaster harness has five adjustment points and they ship tightened to their smallest configuration.

Make sure all the straps extending from the three-point front support junction are all adjusted properly. They can each be extended for a looser fit, positioning the handle farther back. The chest and belly straps can also be lengthened. The harness should be snug, but not constricting.

The three straps that join in front through the junction with the yellow lining and small white Ruff Wear logo all have sliding plastic adjusters. Slide these adjusters toward the junction to extend the straps. Extending the belly and chest straps should be obvious.

We recommend the AST Get A Grip for larger, less mobile dogs. Its handles are longer and distribute support across the underbelly. Their Pet Support Suit is a custom order harness to fit extra large dogs, or address special body shapes.

Although we no longer carry the Help 'em Up harness, if Sadie needs additional rear end support, you might consider that. Thanks for asking, hopefully others will provide more user feedback for you.

If you measured the girth correctly, a larger harness will likely be too loose. If it does not provide the rear end support you think Sadie needs, check out the Help 'em Up. She may just need time to develop strength in her remaining back leg which can take a bit longer in some rear leggers.