Just out today: the Humane Society’s map showing state rankings for animal protection laws in all fifty states. California is #1 with 45 of 65 points, and South Dakota comes in dead last with just 8 points. Meaning you can pretty much do whatever you want to an animal in South Dakota with just about zero risk of punishment.
You can hover your mouse pointer over any state to learn the details of recent wins or losses concerning animal law. (Thanks, Josh.) Link.