Make an example of him.

Take him out beyond the Porta Esquilina and whip him to death.

Let me never see him again." Pisander sprang up in his corner, quivering with righteous wrath.
"What is this ?" he cried.

"The lad is not guilty of any real crime.

It would be absurd to punish a horse for an action like his, and a slave is as good as a horse.