Since I know people who do eat horse... or rather pony because those are basically FREE through the sale barns because the shippers won't pay for them to truck them up north, plus they fit better in a freezer I hear.
My thought on the subject is don't ask for permission to/or tell the fed you are eating them.
Seems to work OK for the folks I know.
But then that's just back yard to table food.
And the folks do keep them on green pasture for 6months to make sure they are fat and clean of any medications.