Throbak is correct. Something not right about that story. Something had to be wrong with the horse to begin with, or the coyotes wouldn't have messed with it.. We have a TON of horses in our 'hood, and none have every been messed with by coyotes.

Here's one:

http://denver.cbslocal.com/2013/05/20/2-children-attacked-by-coyote-in-colorado-springs/