Being aware of the dangers that man-made pesticides have caused in our health, animals and our environment, we have been pleased to introduce our environmentally safe, animal-friendly, and natural plant-based insect control products without harmful side effects — Defy the Fly® Dog Fly Collars, Horse Fly Collars, Horse Fly Leg Bands..  The end user is assured of its environmentally safe properties, since the natural-repellent ingredients used in Defy the Fly® products are exempted by the Environmental Protection Agency.