I have had really good luck with Farnam Equi-spot which is a spot on fly control. It works like fleas and tick meds on dogs and cats. You apply every 14 days. I use that in combination with ultra shield ex. My horse is sensitive to flies and ticks and flysprays and I have had no problems with this combination. And I know that the equi-spot works for my horse, he used to come in covered with ticks and flies and the day after I put this on him no flies and no ticks. I think it lasts every 12 days instead of 14. As far as the missing hair it will grow back when the winter coat comes in. I have heard that MTG helps stimulate the hair into growing sooner but I have never tried it. To protect open cuts though I use corona ointment with swat around it. Or blue kote. The corona ointment will not sweat off and the blue kote is a spray on wound cover. Use the corona when you need a wound to stay open and drain, use the blue kote when you want the wound to dry up and close.