many cases using the prior art wheel 20 the exercise surface width is inadequate for example if the animal 39 s owner is unable to get a larger wheel into the cage the animal fur is likely to rub its fur against the spokes or side wall causing damage the value of many of these animals is dependent on the color and quality of the fur the dish 52 provides a non vertical sidewall with no spokes or obtrusive vertical sidewalls to cause damage to the animal or its fur since the axis of the dish is at 60 u00b0 degrees from horizontal the center portion of the disk slopes away from the exercise surface at 150 u00b0 providing ample room for the animal to exercise freely and to reverse direction without dismounting the 120 u00b0 degree dish 52 provides a suitable inclined surface in front of the animal on which to perform work and ample space in every direction for the animal to be comfortable as the dish or cone apex angle decreases from 120 u00b0 to 80 u00b0 or 90 u00b0 for example the slope increases and the room around the animal decreases an 80 u00b0 or 90 u00b0 dish 52 still allows an animal larger than a prior art device of like radius however not as large as an animal as the 120 u00b0 dish would accommodate as the angle increases past 120 u00b0 the slope of the surface in front of the animal effectively decreases and thus the ability to perform work in place also decreases additionally the 120 u00b0 dish with a 14 inch diameter will fit through a cage door measuring 10 u2033 u00d7 10 u2033 or 9 u2033 u00d7 12 u2033 or larger.