Silly. The law cares about money. The reason cockfighting is a felony is that it's a gambler's sport; no one in South Carolina cares which birds claw each other.
The solution here is obvious; get the bookies to make odds on domestic violence. Or, better yet, have spouses and partners go at it before audiences. "Two points on the lady wearing #43, she's got some muscle on her!"
Result: domestic abuse would become a very serious crime immediately!