St. Peters, MO Animal Ordinances: Dog Leash Laws (2026)

City Code Section 205.120(A) requires every owner or competent person to keep their animal from being 'at large,' and specifies that any domesticated animal off its owner's premises 'shall be on a leash not to exceed ten (10) feet in length.' Subsection B backs that up with a public-nuisance standard: an owner who fails to control an animal that molests passersby or vehicles, attacks other animals, trespasses on school grounds, damages property, or barks or howls excessively is in violation even on top of any leash issue.

On the owner's own property, Subsection C still requires either a responsible adult able to verbally control the animal and stop it from charging at passersby, cyclists or vehicles, or physical restraint behind a visible fence, chain, cable or rope substantial enough to hold the animal; an animal cannot simply run loose in an unfenced yard unaccompanied. Subsection D separately requires any female dog or cat in heat to stay confined in a building or secure enclosure so it cannot reach another animal except for a planned breeding.

Subsection F lets St. Peters residents use an 'Invisible Fence' electronic containment system as a lawful restraint, provided it stays behind the front building line and is properly maintained, and Subsection G exempts police, military and hunting or field-trial dogs performing official duties from the leash and restraint rules entirely. An animal picked up running at large owes a sixty dollar ($60.00) redemption fee under Section 205.180(A) regardless of vaccination status, and a third or later at-large offense can trigger both a summons for public nuisance and a review for a habitual-at-large declaration under Section 205.125.