Originally Posted by Cinnys Whinny
I think I might try to closely monitor and make sure of the amount he's drinking so you know a definite amount and double check that bucket for any small holes or signs that it's leaking.
If it were my horse though, I think I might call a vet to be on the safe side. Extreme thirst can be a sign of some metabolic issues as well as diabetes...yes horses can get diabetes.
One of my trainer's horses has diabetes. She has to feed him a grain with less sugar and molasses in it, and he has to wear a muzzle in the pasture. He also has to get his hooves trimmed every 6 weeks. Other than that he's an easy keeper.
As for the problem that the OP is having...I would call the vet. Better to be safe than sorry. I've called the vet about something that ended up being nothing to worry about before...Cost me $80 but I would gladly spend that and have nothing to worry about, than having to spend $800 for a whole bunch of ''horsey'' hospital bills. But before you spend money on the vet, I would do as suggested by Cinny and check the bucket for leaks.