Horse slaughter is when people kill horses for their meat. Some people eat horse meat because they like the taste of it. But other people think it's mean to kill horses because horses are normally used for things like riding or racing.
Sometimes, if a horse gets really sick or injured, the owner can't take care of it anymore. In those cases, the owner might sell the horse to a person who wants to use the meat for food.
But there are also some people who think it's wrong to kill any animal for meat. They believe that we should only use animals for things like pets or transportation.
Overall, some people think horse slaughter is okay, while others think it's not okay. It's important to respect everyone's opinions and treat animals with kindness and respect.