MO HB3304

Expands the "keeping a dangerous dog" offense to apply after a single unprovoked bite of a person or domestic animal, removing the previous requirement that the dog must bite again on a subsequent occasion

Establishes tiered penalties: Class B misdemeanor for basic offense, Class A misdemeanor if attack causes serious physical or emotional injury, Class E felony for repeat serious attacks, and Class D felony if the attack results in death

Adds "serious emotional injury" as a qualifying harm alongside serious physical injury for elevated charges

Requires mandatory seizure and destruction of dogs that bite a second time or cause serious injury/death on first attack, with a 10 business day holding period after owner notification

Allows owners to file written appeals to circuit court within the holding period, with disposition hearings required within 30 days; owners may be ordered to pay impoundment costs during appeal