system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are horses put down if they break a leg during a race instead of rehabilitating the injured animal?
gpt
To heal a broken leg relatively painlessly, the animal needs to stay off of it. Horses don't/can't do this. They suffer tremendously, and the leg never fully heals. It is more merciful to put them down.