Rotating Puzzle Feeder Bowl to Prevent Pets from Eating Too Fast Color: Blue Size (approx.): Width 26cm x Depth 31cm Height 19-25cm (adjustable) When you turn the rotating roll on top, food falls into the dish below. The dish has an uneven shape, which helps prevent fast eating. I bought this for my dog (3kg), but it was too big for a small dog and he couldn't rotate it, so I'm selling it. (Therefore, it has only been used once.) It should be fine for medium-sized dogs. Please understand that this is considered a used item from the time it was opened.