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I have 2 horses of whom I feed garlic too. I read once about garlic helping with house flies. So I got my first horse and she was only 1.5 years old. I bought garlic powder, and was giving her half a cup daily. Within one month, the flies were no longer a bother to her by 99% This also included the big bitting horse flies, ticks as well as mosquitoes. I had to slowly give the garlic to her and disguise this with allot of shredded carrots or whatever that worked until she was use to it and kept adding more until I reached half a cup, which is the recommended dosage for horses. Anything less then half cup and it doesn't work. The site I get my garlic from is Springtimeinc.com "Bug off Garlic" for horses