I have an older cat and I want to make sure that she is drinking enough water. This product is perfect.  I recommend following the set up instructions, but once that's done it's pretty simple.  I plugged it in and my cat was immediately attracted to it.  After a couple of quick sniffs, she was drinking water.  She kept going back to it and drank quite a bit of water the first day.  Pros - your pet will drink more water and easy to fill.  Cons - slight humming noise from the pump and it needs to be on a level floor. I had some water spill over because our 1890's farmhouse floors aren't all level.  If the water reservoir was a bit deeper, that problem would be solved.  You will also need to make sure that it doesn't run low on water, it's hard on the pump.  The 60oz size is perfect for cats and small dogs, however I don't think it would not work very well for medium or large dogs. This is a great product to keep your pet hydrated.