Some pets seem to prefer drinking water from the tap rather than from their own bowl. Perhaps it’s something about the movement of the water or the sound of it flowing. A pet drinking fountain provides both these properties, and may encourage your pet to drink. On the other hand, what may appeal to the animal is the fact that water from a running tap is nice and cold. This is something that cannot be provided by drinking fountains.
Pet drinking fountains:
Pet drinking fountains example. Pictured: Drinkwell Lotus Ceramic Fountain
Also of interest: Drinkwell Big-Dog Pet Fountain / Hagen Catit Design Fresh and Clear Cat Drinking Fountain / Continuously Filtered Water Ceramic Pet Drinking Fountain by Pioneer Pet