Sometimes salt bricks/blocks just aren't
enough. The owner of the farm where my gelding lives alternates white and
mineral blocks outdoors for the horses, but my guy also needs loose white salt
in his grain/beetpulp meals.
Generally my horse is a good drinker. For
instance, on the few winter nights when they're in their stalls
because of really horrible weather, he drinks almost all of the water in his
bucket before it can freeze.
But in the fall of 2003, he had a mild impaction
colic. My normally voracious eater came in at dinner time and wasn't
interested in food. Giant red flag. After the vet had treated
my horse, he suggested that I add loose white salt to his supplement
baggies, and so far we've had no further problems.