I have only heard of horses getting electrocuted
when there was no Ground Fault Interrupter on the power to the heater. I have
the tank heater that goes in the drain hole, so no cord for the horse to get a
hold of, and play with, and also have a GFI on it.
What a tragic loss. So sorry to hear of it. Let
us know if there is anything else we should know, to maybe save someone else's
horse.