Something's probably wrong. Call a horse vet.
If you have a horse, you definitely need to start reading up about them
Get some books, type "horse health" into google, or "owning a horse"
Example website:
http://www.thehorse.com/
If reading isn't your thing... I'm sure there's probably tutorials and lessons on youtube, or find some friends or acquaintances who know more than you and talk to them.
Take a class about horses, or go to a horse-themed summer camp, depending on how old you are. I worked at a ranch summer camp for a couple of years as a teenager, and learned a lot.
Horses are people too, you got to know about them if you want to take care of them and you don't want them to be sick.
Answered Jan 01, 2011
Edited Jan 01, 2011