I have a 6 year black lab that did the very same thing. I watched closely to see why. What she was doing was trying to lap the water off the bottom of the bowl. Even though the bowl was three inches deep and filled to the top. Never did break her of this habit, but as she ages she is not as bad. But still a very sloppy drinker. Just love her, and learn to live with it.
24 hours in a day, 24 cans in a case, you do the math