510 ILCS 70/4.03
It shall be unlawful for any person to willfully and maliciously taunt, torment, tease, beat, strike, or administer or subject any desensitizing drugs, chemicals, or substance to (i) any animal used by a law enforcement officer in the performance of his or her functions or duties, or when placed in confinement off duty, (ii) any service animal, (iii) any search and rescue dog, (iv) any police, service, or search and rescue animal in training, or (v) any accelerant detection canine used by a fire officer for arson investigations in the performance of his or her functions or while off duty. It is unlawful for any person to interfere or meddle with (i) any animal used by a law enforcement department or agency or any handler thereof in the performance of the functions or duties of the department or agency, (ii) any service animal, (iii) any search and rescue dog, (iv) any law enforcement, service, or search and rescue animal in training, or (v) any accelerant detection canine used by a fire officer for arson investigations in the performance of his or her functions or while off duty.
Any person convicted of violating this Section is guilty of a Class A misdemeanor. A second or subsequent violation is a Class 4 felony.
510 ILCS 70/4.03