This is a lot smaller than I realized. It is perfect for a cat or small dog. I have 2 cats a medium-sized dog. My older cat loved this at first and began using it immediately. My younger cat is afraid of the, at first, inaudible to human ears noise it makes. My dog makes a huge mess trying to use this so I don't encourage him to use it. The pump was pretty quiet for the first few days to me. As the days have gone on the pump is making a noise that will not stop. I tried taking it apart and cleaning it again and refilling it but it still makes a weird noise. Now my older cat has stopped using it because of the noise. Overall it's made of plastic but seems sturdy enough.