Our dog is a mixed Australian Cattle, lab and Pit. He is stocky and pure muscle. Measurements are NOT accurate, as I measured like they tell you in the listing and Mackie's measurements tell me extra large due to his chest. His legs are shorter and he's only 55#. I got a MEDIUM. It is almost too big. He was viciously attacked by two Black Labs while on a leash with my husband on a typical walk. This item has been perfect so far. No sliding of pads or bandages that are on the leg wounds. Leg part holds it in place. I recommend this product. Dogs come in different sizes and this item is stretchable with ample room to adjust. Do not purchase an Extra large unless your dog's chest is a to n larger than 31". Medium is good for our dog with a 31" chest and shorter legs. Good luck!
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