I had an old Appy who was very allergic to the no-see-ums, and I used to coat his underline and the dock of his tail with Bag Balm . . . and did use Tea Tree oil on the dock of his tail, too, but it's pretty expensive stuff.
The other thing I did with him is feed him Garlic from Springtime, Inc. (www.springtimeinc.com) You can order a catalog from them.
I was told by a woman who did carriage rides in Stowe, VT, during the summers (Black Percherons) that she had tried EVERYTHING to combat the flies on her horses to keep them comfortable and fly-free for work, and the ONLY thing she found that worked was the oil-based, old-fashioned, citronella WIPE that we used in the tin can when we were kids. She said it stayed on and fought the flies all day long in the heat and through the horses' sweat.
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