Using Fly Spray When Your Horse is Tied Up Learn how to safely fly spray your horse when he's tied up. By H&R Editors | December 26, 2021 | 1 minute read Monique Potts explains how she likes to introduce a horse to fly spray when she’s in a scenario where the horse might be tied up in the barn or in his stall. Click here to watch now! What did you think of this article? Submit Rating Thank you for your feedback!