Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 578.608. Animal may be killed, when, by whom--immunity from liability, when--trespass by animal, when

1. A law enforcement officer or other person may kill a large carnivore if such officer or person observes or has reason to believe that the large carnivore is chasing, attacking, injuring, or killing:

2. No law enforcement officer, animal control officer, or person shall be held civilly liable for damages or otherwise for killing or attempting to kill a large carnivore under subsection 1 of this section.

3. A large carnivore's entry onto a field or enclosure that is owned by or leased by a person producing livestock or poultry constitutes a trespass, and the person who owns or possesses the large carnivore is liable in damages.