Missouri Revised Statutes 273.036

Chapter 273
Dogs–Cats

The owner or possessor of any dog that bites, without provocation, any person while such  person is on public property, or lawfully on private property, including the property of the owner or possessor of the dog, is strictly liable for damages suffered by persons bitten, regardless of the former viciousness of the dog or the owner’s or possessor’s knowledge of such viciousness.

Owners and possessors of dogs shall also be strictly liable for any damage to property or livestock proximately caused by their dogs. If it is determined that the damaged party had fault in the incident, any damages owed by the owner or possessor of the biting dog shall be reduced by the same percentage that the damaged party’s fault contributed to the incident. The provisions of this section shall not apply to dogs killing or maiming sheep or other domestic animals under section

http://www.moga.mo.gov/mostatutes/stathtml/27300000361.HTML

More info here 
https://www.animallaw.info/statute/mo-dogs-consolidated-dog-laws#livestock

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