FitPaws Egg - Blue 85cm with Training DVD. The FitPaws Egg is a new shape of stability ball for the advanced canine athlete. It has a greater balance challenge due to its uneven shape and will shift in mulit-directions for advanced proprioception and body awareness. The professional grade, heavy duty PVC material is formulated for use with dogs, providing superior gripping and resists damage caused by dogs nails. When used in a core conditioning program, the FitPaws Egg can improve balance and coordination as well as stabilize weak areas. The FitPaws Egg easily inflates with an air pump (sold separately). You can also adjust the balance challenge by under-inflating the ball so it is not as firm.