Dog Hock Brace (Pair)The Back On Track Hock Brace is manufactured from a revolutionary, durable polyester material, which incorporates a unique ceramic fabric that gives the product its heat reflecting properties. The product is secured using four hook and loop straps. To obtain the appropriate size requirement, measure the circumference of the animal's leg above the first joint (tarsus) to give you the upper leg dimension. Measure the circumference of the animal's leg