510 ILCS 5/12
The owner of any animal which exhibits clinical signs of rabies, whether or not the animal has been inoculated against rabies, shall immediately notify the Administrator or, if the Administrator is not a veterinarian, the Deputy Administrator, and shall promptly confine the animal, or have it confined, under suitable observation, for a period of at least 10 days, unless officially authorized by the Administrator or, if the Administrator is not a veterinarian, the Deputy Administrator, in writing, to release it sooner. Any animal that has had direct contact with the animal and that has not been inoculated against rabies, shall be confined as recommended by the Administrator or, if the Administrator is not a veterinarian, the Deputy Administrator.
510 ILCS 5/12