St. Louis County, MO Animal Ordinances: Breed Restrictions (2026)
Key Facts
- Basis
- Behavior, not breed
- Trigger
- Attack causing serious injury/death
- Or
- 3+ nuisance citations in 12 months
- Required
- Locked fence, sign, ID chip, neuter
- Max penalty
- Court-ordered euthanasia
Summary
St. Louis County declares dogs, cats, or other animals dangerous by behavior, not breed, then locks in fencing, signage, and chip mandates.
Every person responsible for a dangerous animal shall: a. Confine such animal to a securely locked fenced enclosure of such height, strength and construction so as to prevent the animal confined from jumping or climbing over, climbing through or crawling under such fence. (The use of a system which produces an electric shock to confine the animal does not meet the requirements of this section); and, b. Post a notice on the premises in a place conspicuously visible to the public and reading in letters not less than two (2) inches high "Dangerous (Dog, Cat, or Other Animal)," indicating the type of dangerous animal which is on the premises
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 85 | Traffic: Supplement 80).
Full Breakdown
SLCRO § 611.190 kicks in once an animal meets the § 611.040 definition of "dangerous": an unprovoked attack causing serious injury or death, or three-plus nuisance citations in twelve months. Breed is never a factor. Once declared, the owner must confine the animal in a securely locked fenced enclosure (electric-shock fencing does not qualify), post a two-inch-letter "Dangerous (Dog, Cat, or Other Animal)" sign, implant an ID chip, and have the animal sexually neutered. A court may order euthanasia if the animal escapes confinement.
Violations & Fines
Escaping confinement, missing signage, or skipping the chip/neuter mandate can bring impoundment, prosecution by the county counselor, and a court-ordered euthanasia if the animal wasn't properly confined.
Frequently Asked Questions
Does St. Louis County ban specific dog breeds?
What must an owner do once an animal is declared dangerous?
Sources & Official References
Other rules in St. Louis County
How St. Louis County compares: Cities with No Dog Breed Restrictions·Compare St. Louis County to another location·View the Missouri animal ordinances overview
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