Impaction colic generally means severe constipation. Yes horses get constipated and it could be deadly. Would you know what the signs or symptoms are? There are things you can do to help prevent this.

Causes of constipation
*Stress
*Poor diet
*Dehydration: if this happens they will more than likely need IV fluids
*Not able to chew food properly (usually found in older horses)
*Intestinal blockage from stones, sand, parasites or other foreign objects

Signs of constipation
Rolling
Pawing
Depression
Lethargic
Stretching out
Dry or hard manure
Kicking at their abdomen
Lack of or decrease in appetite
Lower production of manure
Frequently laying down and getting up

Prevention
Make sure your horse is getting plenty of water. I don’t like automatic waterers because you can’t tell how much a horse is drinking. During the winter they won’t drink as much if the water is cold so it would be best to give them tepid or lukewarm water. Heated water buckets are great.

Exercise is important for digestion as horses were meant to move several miles a day.

De-worming on a regular basis.

Getting proper dental care

If you notice mucous in the manure that is a sign of intestinal irritation. Horses with constipation will need a laxative, but never give them human laxatives. If you are unsure or your horse shows any of the following signs above contact your veterinarian immediately.