My Dancer is notorious for playing in the water trough. She loves to splash the water around with her head, or stick her feet in the trough and paw water all over her belly.
Her previous owner didn't have a pond, and we kept Dancer in our lot for several weeks before letting her out in the pasture with our pond. You should have seen her face when she saw all that water - her eyes were HUGE!
She ran straight out into the pond, only to discover it wasn't shallow (pond was made by damming a very deep ravine). She figured out in a hurry how to swim.
We have to keep a close eye on the horses when we turn them out right now. The pond is so low due to the drought that the edges are super muddy. We've already lost a very elderly dog to the mud and pond weed.
We sure don't want to lose a horse!