I bought this fountain because my cat was having several bladder and kidney problems. He had sediment in his bladder from not drinking enough water. As far as i cen tell he loves this fountain. I also have a medium sized dog who drinks from it as well... we coul,d not have a smaller size as I have to refill this every couple of days. I was iffy about buying it on reports of it being so noisy but it really isn't that bad. You can hear it- it isn't completly silent but it isn't extremly loud and my house is very quiet for the most part. I would definatly recommend it!
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