I have two ponies that loved
to use the big 150 gallon Rubbermaid water trough as their personal wading
pools. Doesn't matter what the season -- summer or winter -- they would
climb in with both front feet, one waiting patiently for it's turn while the
other churned the water into what resembled the Muddy Mississippi.
Those splash-happy ponies
used to scare the wits out of the poor goldfish on
duty.
Finally, after spending one
morning filling up the trough and coming back a few minutes later to find
BOTH with front feet in the tough together playing like they were on
the Wild Rapids River Ride at a major theme park, I gave
them a low-profile
sheep's water trough to play in, and set the 150 gallon up on high cinder blocks
-- high enough that neither can lift their leg high enough to put it in the
water, but low enough that all the ponies can still drink from
it.