(Photo courtesy of YouTube)
Once upon a time when I had a dog, I would watch her go into the laundry room where her water dish was and then I would hear a lot of noise while she drank water out of her dish. Then, I would go in there and see splashes all over the floor. I could never figure out why she was so messy.
Thanks to this video, I now know the answer. Even though the dog's tongue clearly forms a cup, it doesn't help get the water into the mouth of the dog, it seems to merely bring the water up into the air in the direction of the dog's mouth.