There is a filly at our barn who likes to stick her hoof in the water trough in the pasture and splash the water everywhere. Of course, this gets the water quite muddy so we have to clean it out several times a week. Not only is this kind of irritating for us and a waste of water, but there is the possibility of her getting her foot stuck in there and freaking out. The filly is a year and eight months old. We cannot see the pasture from the barn, but when we are out there and she sticks her foot in there, she is corrected. She also does this with the water bucket in her stall. She is in an outdoor stall so her water bucket is just a plastic bin on the ground.
What can we do to completely stop this behavior?