GENERAL ATTITUDE / PAIN LEVEL
Horses have a low threshold for pain. It is an easy parameter to obtain from a distance. Observe for any sweating, quivering, flared nostrils, dullness of eyes, position of the ears, pawing, rolling, biting at the flank, kicking at the belly or stretching.
Determining the severity of the horse's pain may help to determine the character of the cause of the colic, i.e., milder more intermittent pain may point to a luminal obstruction while continuous, more violent signs of pain may point to a vascular obstruction (volvulus, torsion, or strangulation).