This is perfect for my medium sized dog. I have the larger one but I feel like I have to clean that out more and it’s a pain. The smaller one is more simpler to clean and I just have to fill it up every few days with extra water to increase the level. The water flows well with the filters and they can be used in the large ones as well so I didn’t need to do get extra accessories because I stocked up. My dog is anxious and scared and the water fountains that make bubbles when the water goes low scares her and makes her jump. This one flows continuously so she isn’t scared to drink water.