Updated: Mar 11, 2020
Some of us get befuddled, some of us disgusted, and others just laugh because there's a cat in your sink drinking out of the faucet.
Why does your cat do that?
Our house cats have only been domesticated about half as long as dogs, so their instincts are incredibly strong. And these instincts are telling them, naturally, to drink the cleanest water they can find. A perfectly clean water bowl to you may appear quite different to a cat. Cats' ancestors didn't have the luxury of running water or a guardian to refill bowls. So that standing pool of water could, in fact, be quite dirty! How long has it been sitting there? Is it growing bacteria? Have other strange animals bathed in it or used it?
A much fresher and safer option is to find moving water somewhere. Let's see, where can we find moving bodies of water in this thing you call a house ... ? Aha! Over there in the sink, there's fresh water coming out of the faucet! That is by far the cleanest available option.
If you don't find this behavior amusing, we can certainly work with your cat to give different water options and alternate behaviors. As always if you notice a dramatic increase in water consumption or hydration seeking behavior, call your veterinarian right away.