Conditions or ailments that are the cause of a problem that you see - your observation.

Your vet may diagnose

Intestinal Parasitism (in Adult)


Clinical parasitism can take many forms but what I am referring to here is signs of illness that are caused by the presence of parasites.

Intestinal parasitism is a common cause of weight loss, colic, diarrhea, and poor body condition in horses. It has been greatly reduced in the last 30 years due to improved dewormers and more frequent deworming. Unfortunately we are beginning to see resistance to dewormers and thus increased disease caused by worms. Due to this, the new approach to parasite control is fecal testing and targeted deworming.

Parasitism inhibits proper absorption of nutrients even if a horse's diet is otherwise adequate, resulting in a dull or poor haircoat.

my vet's role


Prognosis depends on the severity of the worm burden, and your horse's general health.

Author: Doug Thal DVM Dipl. ABVP