510 ILCS 5/15.4: Potentially dangerous dog.

A dog found running at large and unsupervised with 3 or more other dogs may be deemed a potentially dangerous dog by the animal control warden or administrator. Potentially dangerous dogs shall be spayed or neutered and microchipped within 14 days of reclaim. The designation of "potentially dangerous dog" shall expire 12 months after the most recent violation of this Section. Failure to comply with this Section will result in impoundment of the dog or a fine of $500.