Spasmodic colic always begins suddenly
Symptoms. These should be carefully studied in order to diagnose this
from other forms of colic requiring quite different treatment. Spasmodic
colic always begins suddenly. If feeding, the horse is seen to stop
abruptly, stamp impatiently, and probably look back. He soon evinces
more acute pain, shown by pawing, suddenly lying down, rolling, and
getting up. During the period of pain the intestinal sounds, as heard by
applying the ear over the flank, are louder than in health. There is
then an interval of ease; he will resume feeding and appear to be
entirely well. In a little while, however, the pains return and are
increased in severity, only to pass off again for a time. As the attack
progresses these intervals of ease become shorter and shorter, and pain
may be continuous, though even then there are exacerbations of pain.
Animals suffering from this form of colic evince the most intense pain;
they throw themselves, roll over and over, jump up, whirl about, drop
down again, paw, or strike rather, with the front feet, steam and sweat,
and make frequent attempts to pass their urine. Only a small quantity of
water is passed at a time; this is due to the bladder being so
frequently emptied. These attempts to urinate are often regarded by
horsemen as symptoms of trouble of the kidneys or bladder. In reality
they are only one of the many ways in which the horse expresses the
presence of pain. As a matter of fact, diseases of the bladder or
kidneys of the horse are exceedingly rare.
Fonte: Diseases of the Horse