If someone tries poisoning your pet, what should be the punishment?

My friend got very emotional last week. Her cat survived from a poison attempt. They found who the 2 scumbags were; 12 year-old boys from dysfunctional families.

If someone tried poisoning your pet, what would you do? What should be the punishment? What if it was a minor (12 and/or younger)?
If someone tries poisoning your pet, what should be the punishment?
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