My husband's Belgian cross gelding has suddenly started putting his feet in our 100 gallon water trough. He has never done this before, but now will not leave the water trough alone. He overturns the trough when he tries to pull his feet out of it, and has dumped 300 gallons of water today alone. I'm also afraid of him stepping on the tank heater we just put in for the winter and either breaking it or injuring himself.
Is there something that would make a horse (who is 15 years old) suddenly start doing this that I am not aware of, or is there something we can do to prevent it from happening? We're limited to where we can move the trough and still be able to reach it with the hose we have installed in the barn.