The Volas Pet Dog Rear Leg Injury Recovery Support Harness listing says adjustable fit. The first photo is a wide grey band on a standing golden retriever.
Hold the product against your dog’s midsection and rear as the title suggests, and look for any sliders or fasteners in the other images. This article will not invent buckle steps. If the band is loose or cuts in, do not use it as shown.
Compare the Volas harness photos.