Dog fighting
Dog fighting is illegal in every U.S. state and in many countries around the world (Britain, where it was quite popular, banned it as far back as the 1830s), although enforcement in other countries is frequently lax or nonexistent. Dog fighting is a felony in all states except Idaho and Wyoming, where it's a misdemeanor. It is a felony to possess dogs for fighting except in the states of New York, Texas, West Virginia, and Wyoming.