Animal Ordinances in O'Fallon, MO (2026)
9 verified animal ordinances for O'Fallon, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
Dog Leash Laws
O'Fallon bans letting any dog run at large within city limits. The code defines at large as off the owner's premises and not on a leash shorter than eight feet, controlled by someone physically able to stop the dog from running free.
O'Fallon Dog At-Large and Leash Requirements
Some RestrictionsO'Fallon Code § 210.030(A)(1); § 210.020
Shall not permit the animal to be at large within the City limits. [Section 210.030(A)(1)] ... AT LARGE: Off the premises of the owner and not on a leash of less than eight (8) feet in length controlled by some person physically able to prevent the animal from running free. [Section 210.020]
Breed Restrictions
O'Fallon has no breed ban. Instead, the Chief of Police can declare any animal dangerous based on its conduct, such as a severe bite or a fighting history, and dangerous animals must then be registered, muzzled or confined, and marked with warning signs.
O'Fallon's Dangerous Animal Law Is Behavior-Based
Significant RestrictionsO'Fallon Code § 210.035(A)
The Chief of Police or his/her designated representative shall classify any animal with the following characteristics as a dangerous animal for purposes of this Chapter: 1. Any animal that has inflicted a severe or fatal injury on a human on public or private property. The term "severe injury" means any physical injury resulting directly from an animal's bite or attack, which results in broken ...
Exotic Pets
O'Fallon outlaws selling, owning, or harboring bears, big cats, wolves, wolf hybrids, coyotes, and dangerous or poisonous reptiles anywhere except a licensed zoo, circus, research lab, veterinary hospital, or animal refuge. Farm animals also require agricultural zoning.
O'Fallon Bans Big Cats, Wolves and Venomous Reptiles
Heavy RestrictionsO'Fallon Code § 210.170
It shall be unlawful for any person to sell, own, possess or harbor any bear, lion, tiger, leopard, ocelot, jaguar, cheetah, margay, mountain lion, Canada lynx, bobcat, jaguarundi, hyena, wolf, wolf hybrids or coyote, or any deadly, dangerous or poisonous reptile in any place other than a properly maintained zoological park, circus, scientific or educational institution, research laboratory, ve...
Wildlife Feeding
It's unlawful to give any wild animal or bird food, drink or a noxious substance in an O'Fallon city park, and separately unlawful to feed, hunt, trap or molest any animal, fish, reptile or bird on park property. Rangers and police enforce it as a park-property violation.
O'Fallon Bans Feeding Wild Animals in City Parks
Some RestrictionsO'Fallon Code § 225-020(A)(7)
Give, offer or attempt to give any animal or bird any food, beverage or any known noxious substances.
Pet Limits
O'Fallon limits households and businesses to three animals over three months old. The cap can be lifted only with written permission from every surrounding adjacent property owner, or if the location is a licensed boarding, sale, or care business.
O'Fallon Caps Pets at Three Per Household
Some RestrictionsO'Fallon Code § 210.030(A)(4)
Shall not keep, or cause to be kept, maintained, or controlled, more than three (3) animals, over the age of three (3) months, per household or business establishment, except: a. When a household owner obtains a written permission from all surrounding adjacent property owners. b. When a business establishment is licensed to board, sell, care for, or protect animals.
Cat Rules
O'Fallon's Animal Control Ordinance treats cats the same as dogs under its general control-of-animals rules: no city cat license exists, but owners must keep a female cat in heat confined so she cannot reach another animal, and the same section caps how many cats a household may keep.
O'Fallon Rules on Cats in Heat and Confinement
Some RestrictionsO'Fallon Code § 210.030(A)(6)
Shall keep every female dog or cat in heat confined in a building or secure enclosed in such manner that such female dog or cat cannot come into contact with another animal except for a planned breeding. ... Shall ensure the animal is properly vaccinated against rabies and other diseases as may be necessary; and displays a current St. Charles County Department of Health tag. ... Shall not keep,...
Microchipping
O'Fallon does not require every pet to be microchipped, but any dog, cat, or ferret picked up running at large, or one that has bitten a person or animal, must be permanently chipped before it is released from impoundment, and the owner pays the fee.
O'Fallon Requires Chipping for Impounded Loose Pets
Some RestrictionsO'Fallon Code § 210.180
Any dog, cat or ferret which is apprehended running at large or who has bitten a human being or animal shall be permanently identified by the implantation of an encoded, inert chip or like device which contains a unique identifier capable of providing a permanent record of the identity of the animal. Such device shall be implanted prior to the release of the animal from impoundment. The cost of...
Pet Groomer Rules
O'Fallon's Zoning Code defines a 'pet grooming facility' as a business that provides hygienic care such as shampooing, brushing and trimming, and it allows a single dog under an individual's control to use supervised outside space. But the same definition draws a hard line: pet boarding or kennel operations at a grooming facility are prohibited unless the operator first obtains a conditional use permit.
O'Fallon Pet Groomers Need a Permit to Board Animals
Some RestrictionsO'Fallon Code § 400.035 (Zoning Code Definitions)
PET GROOMING FACILITY: An establishment engaged in the business of providing hygienic care to animals (i.e., shampooing, brushing, trimming, etc.). A pet grooming facility may have supervised outside activities, which are defined as having a single animal under the physical control of an individual. Pet boarding/kennels are prohibited without the approval of a conditional use permit.
Bird Protection
O'Fallon's park code bans anyone from hunting, molesting, harming, trapping, shooting at or killing any bird on park property, and separately bars taking a bird's eggs, nest or young. It also folds in a duty to follow the Missouri Wildlife Code while on park land.
O'Fallon Bars Harming Birds in City Parks
Some RestrictionsO'Fallon Code § 225-020(A)(6)
Feed, hunt, molest, harm, frighten, kill, trap, chase, tease, shoot or throw projectiles of any kind or nature at any animal, fish, reptile or bird; nor shall be/she remove or have in his/her possession the young of any wild animal or the eggs or nest or young of any reptile or bird...or in any manner violate the Missouri Wildlife Code.
Looking for St. Charles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement O'Fallon city rules.
Animal Ordinances in St. Charles County →