Target and Petsmart (or other pet places) sell things that hold the dogs water bowl off the floor. They make them for small dogs and for big dogs. It actually makes it easier for your dog to drink, they don't have to bend as far. My son was fascinated by the water and would play with it, put his toys in it...etc. It was a phase, I washed a lot of towels. Consider it a science experience for your toddler and keep wiping up water. If your son fusses when he is wet, let him stay wet a bit (not until he is cold and miserable or anything). Finish something you started before you change your son and remind him that he is wet because he knocked over the dogs water bowl. Being wet is a natural consequence of playing with/knocking over water. Also, when you wipe up the water, involve your little one. He made the mess, he can help clean it up. Again, a natural consequence. You don't have to yell, be mad or anything just "oops, you knocked over the doggies water bowl, guess you'll be wet while mommy finishes...., you can get changed after we get the water all wiped up." He can help wipe up while your hand is over his little hand wiping up the water. Truthfully, some of it is probably curiosity. I am sure it is driving you crazy, all the times I wiped up water it drove me crazy too. (Free moment of floor cleaning!)
:)
Good luck with your little scientist!
N.