A trained animal... That's exactly what most people are!
When a baby is born, the parents train it and tell it what to do. When the child goes to school, it's time for more training, except now you're in puppy play group with all the other kids being trained.
And then, when you're out of there, you get a job. And your boss tells you what to do, and if you don't do as you're told... Sorry, no money for you.