...has been terrible for flies! Seriously here in VA has just been awful! But anyways to the root of my question. I have tried fly sprays, multiple kinds (endure,bronco,some natural kind,etc) and nothing is working. It may work for like 5 minutes and then it is no good. The problem I'm having is my mare has bites everywhere and she is so cranky constantly stomping and swishing her tail because you can tell they are annoying her. So this is probably a stupid question but do fly sheets actually help keep them off and from biting? I've never had to use one before but am seriously considering getting one for her. If so is there a certain brand you'd recommend?