Ill. Admin. Code tit. 11 § 605.40
A certificate of veterinary inspection and entry permit are not required for Illinois equine. Illinois equine traveling out of the State, for 30 consecutive days or less, on an Illinois certificate of veterinary inspection are not required to obtain a permit to return home. If, however, Illinois equine are out of the State longer than 30 days (i.e., boarding, training), a certificate of veterinary inspection issued by the state where the animal has been residing and an entry permit will be required. Once an animal has been out of the State longer than 30 days, it is no longer recognized as being an Illinois native animal. All equine entering Illinois for any reason other than slaughter must be accompanied by a negative test for equine infectious anemia (EIA) conducted within a year if the animal is more than one year of age, certificate of veterinary inspection issued by an accredited veterinarian within 30 days prior to entry, and an entry permit number issued by the Illinois Department of Agriculture. The organization licensee shall be responsible for compliance with this Section.
Ill. Admin. Code tit. 11, § 605.40