I've always used a butter knife. It works great, and you don't have to worry about cutting the horse. We have tons of botflies here, and check the legs every day for eggs. Their bites are nasty and swell up half your arm, if your horse eats the eggs they can hatch in their stomachs, and the eggs can also hatch on the body and burrow into the flesh (which is uncommon, but I've seen it happen). Nasty nasty nasty little buggers!! I hate them! Oh, and their absolutely HUGE in case anyone has never seen one.
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