50cm size
A few years ago we bought the first one, our 20kg, 15-year-old dog uses it. We only use one side of it (it’s stable like this too), the side with water, and on that side the ring bends outwards a bit, but it’s not bothersome at all. The product looks exactly the same as when it was new (the paint hasn’t chipped off...), we use it indoors. We just bought the second product, and its quality is exactly the same as the previous one. When I opened the new product from the plastic packaging, the bag had a musty smell.