O'Fallon, MO Animal Ordinances: Breed Restrictions (2026)

035(A) authorizes the Chief of Police or a designated representative to classify any animal as a dangerous animal, regardless of breed, if it has inflicted a severe or fatal injury on a human, attacked or bitten a domestic animal without provocation to a degree requiring veterinary attention, killed a domestic animal, livestock, or poultry off the owner's property without provocation, been owned or trained for fighting, or been deemed fierce or dangerous by the City or another government entity. Severe injury is defined as a bite or attack causing broken bones or lacerations requiring stitches or hospitalization, and the victim must supply photographic proof or medical records.

The owner gets written notice within five working days and may request a hearing before the Municipal Judge within five working days of that notice; pending the hearing the animal must be confined as if already dangerous. 035(H), the owner must register the animal with the Chief of Police, keep it in a locked enclosure at least five feet by ten feet with secure sides and a secured bottom or twelve inches of buried fencing, muzzle and leash it outside the enclosure, display a warning sign visible from the roadway, and notify police within 24 hours of a sale, death, address change, or escape. 035(G)(1).