FitPaws Trax DonutWith it's unique shape and flattened base, the TRAX Donut offers stability and versatility during training. As you teach your dog to stand, sit, lay and side step on the Donut, the subtle movement under your dog's weight constantly shifts their center of gravity causing their core and limb muscles to engage and strengthen. By strengthening your dog's entire core muscle chain, you are increasing their mobility and agility, while reducing their chance