Horses are companion animals, not meat animals. Killing a horse for meat is like killing a cat or dog for meat. You have bonds with them, not meat from them. Horses are meant to ridden and have close relationships.
read up on some tortured things horses have to go through: http://animalsangels.org/images/stories/pdf/animals_angels_horse_slaughter_compilation_report_-_full_version.pdf
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