O'Fallon, MO Animal Ordinances: Pet Limits (2026)

030(A)(4) provides that an owner shall not keep, or cause to be kept, maintained, or controlled, more than three animals over the age of three months per household or business establishment. Animals three months old or younger do not count toward the cap, so a litter of puppies or kittens under that age does not put an owner over the limit. 020 as the premises on both sides, directly to the rear, on both sides of the property directly to the rear, and directly across the street from the animal owner; or the location can exceed the cap if it is a business establishment licensed to board, sell, care for, or protect animals, such as a kennel, pet store, or veterinary clinic.

030(A) subjects every animal in the household, whether under or over the cap, to the general at-large ban, the public nuisance and peace-disturbance prohibition, the rabies vaccination and county tag requirement, and the sanitation duty to remove fecal accumulations that could breed flies or create odors. 130.