Holds a gallon of water. I keep fresh drinking water outside for the dog, but if he gets inside then he water in the drinkwell disappears and I have to fill it up again. Sometimes a gallon isn't any big deal, but sometimes I am very busy and a gallon takes awhile to refill if it is more than once a day. The animals like and sometimes I will find a dead cockroach in it. Not pleasant.

Pros: Cat loves it.

Cons: Dog wants to drink out of it too.

this is a greatproduct. the fountain helps to keep the water fresh and not sit still. and get slimey. every animal i know of once they get used to it will drink from it willingly. great

Pros: good for cats and dogs

Cons: none