Yes, a water fountain for cats can be beneficial to cats. 

Cats are more inclined to drink from flowing water because it mimics natural water sources like streams. The continuous circulation of water in fountains also keeps it fresh and oxygenated, encouraging your cat to drink more, which promotes better hydration and overall health.

Yes, you can use tap water in a dog water fountain, but it's advisable to use filtered or purified water if possible to reduce mineral deposits and impurities. If you're using tap water, ensure the fountain has a reliable filter to keep the water clean and safe for your dog. Regular cleaning is also essential to prevent build-up from minerals or bacteria.

When choosing a safe dog water fountain for your dog, prioritize non-toxic materials. Ensure ease of cleaning, and consider features like filters, and quiet operation. These factors will help you pick a dispenser that provides your pet with fresh, clean water.