"I bought these from my local PetCo store. I thought this would be a great idea since my dogs are penned up. It isn't. It is a well made product, but if you have a medium large to large dog, forget it. It just doesn't flow enough water to satisfy my boxer/rhodesian ridgeback mix. She understood it and licked it to get a drink....for over 10 minutes straight she licked it and the water level dropped very little. She just couldn't get enough. Our other dog, Black Lab/german shepherd mix still wont have anything to do with his. I will give them a few more days to keep trying it but will probably end up going back to a bowl."