If you have a long-haired cat, a powerful filter should be a priority. Regardless, a cat fountain should be easy to clean, as you will have to do so eventually. One more thing to consider is the volume of the water pump, because a loud one can be distracting and detract from the charm of having a cat fountain in your home. Certain cats are picky and will respond more enthusiastically to different fountain styles. Some cat fountains have several options for flow designs, and cycling through them can help keep your cat engaged. Convenience is key, and it’s important to find a cat fountain that holds enough water such that you don’t have to replenish it too often. If you have multiple cats that get particularly parched, you’ll want a larger fountain that is accessible to more than one pet at a time.