The Volas Three-Layer Slow-Feeding Pet Bowl is listed as a three-level interactive slow feeding system in food-grade PP, compact, stable and simple to clean. It sits in Pets.
Add dry or wet food the surface can hold. The first photo is a flat round puzzle tray with six wedges, not a stack of three dishes. Stay with your pet. Digestion and safer-eating lines are not treated as proven here.
See the Volas slow feeder in Pets.