Not sure if they are "stable flies" or blow flies, but they have attacked my sheep so bad I had to bring them up from the pasture where they usually spend the summer (grass, water and plenty of trees for shade). Let them go in their winter run in shed, and added a tarp to make it darker. They were being eaten raw, or rubbing their faces raw to get the flies off. Not sure if they are infested with larvae, but sprayed liberally with screw worm spray. Fingers crossed that will do it. Don't usually have this problem, no lambs so no open wounds. Shearing cuts were all healed up.
Different pests this year in veggie patch too, for whatever reasons. Cutworm eating corn seedlings, but so far no potato bugs and few fleabeetles. Way too many voles.
Who knows??????