I was so excited when this item came back in stock, I ordered it ASAP. I purchased the largest size available for my 3 medium sized dogs and I’m satisfied with the size and quantity of water it can hold. My problems with this are that the actual bowl part is somewhat shallow for larger dogs and also seems small with the larger reservoir on it. I find there’s a lot of spillage due to an inadequate bowl. I also wish it performed a bit better. It does refill the bowl when water gets low, however there are times I have to coax it into refilling itself. So only 3 stars imo