510 ILCS 5/2.18b

"Reckless dog owner" means a person who owns a dog that while anywhere other than upon the property of the owner, and without justification, kills another dog that results in that dog being deemed a dangerous dog under Section 15.1 of this Act and who knowingly allows the dog to violate Section 9 of this Act on 2 occasions within 12 months of the incident for which the dog was deemed dangerous or is involved in another incident that results in the dog being deemed dangerous on a second occasion within 24 months of the original dangerous determination.