A few months back, there was a news story about some wise guy who was
selling bottled water for dogs. The radio announcer interviewed a vet who
reminded people that dogs are perfectly happy to drink out of the toilet.

Most actually prefer drinking from the porcelain fountain. The water is
usually more fresh than what's in their water bowl. Mine usually gives me a
disconcerted look if he's watching me take a whiz. It's like "Hey, I drink
outa there!"