It's more like 50+ here in Ohio and there actually ARE a lot of laws regarding owning a horse as well... or at least there are here in Ohio, where we still see them every once in awhile thanks to our Amish/Quaker/Mennonite population.
However, I do like how your argument was to basically say "Nuh uh!". I may not believe the Libertarian argument, but I certainly could debate it better.