Illinois Statutes Chapter 510. Animals § 70/3.02. Aggravated cruelty

(a) No person may intentionally commit an act that causes a companion animal to suffer serious injury or death. Aggravated cruelty does not include euthanasia of a companion animal through recognized methods approved by the Department of Agriculture unless prohibited under subsection (b).

(b) No individual, except a licensed veterinarian as exempted under Section 3.09, may knowingly or intentionally euthanize or authorize the euthanasia of a companion animal by use of carbon monoxide.

(c) A person convicted of violating Section 3.02 is guilty of a Class 4 felony. A second or subsequent violation is a Class 3 felony. In addition to any other penalty provided by law, upon conviction for violating this Section, the court may order the convicted person to undergo a psychological or psychiatric evaluation and to undergo any treatment at the convicted person's expense that the court determines to be appropriate after due consideration of the evaluation. If the convicted person is a juvenile or a companion animal hoarder, the court must order the convicted person to undergo a psychological or psychiatric evaluation and to undergo treatment that the court determines to be appropriate after due consideration of the evaluation.