Update Mar. 19: With no one appearing in opposition, a legislative committee has passed a substitute version of H.B. 1747 by a vote of 10-2.
The substitute version is basically the same as the introduced bill, except for one significant change: If this bill becomes law, "[n]o law criminalizing or otherwise regulating crops or the welfare of any domesticated animals shall be valid unless based upon generally accepted scientific principles and enacted by the general assembly."
This means there could be no local laws regarding the welfare of any domesticated animal including dogs, cats, horses, other pets and farm animals that differ from state laws. Also, any current animal cruelty or animal welfare law in Missouri would be void unless it was "based upon generally accepted scientific principles and enacted by the general assembly." People charged with animal abuse could raise challenges to the law, claiming it was not based upon "generally accepted scientific principles". Possibly, all laws governing animal cruelty or welfare would simply be void