Yeah, i remember a guy who died in washington from a perferated colon due to having a horse fuck him in the ass. Apparantly it isn't a law (at least at the time) to fuck animals that are of decent size, but anything that hurts an animal (ie. your dick in a chicken) is cruelty to animals and is a crime.
I cant imagine someone not thinking that a two foot long horse cock in there ass wouldn't hurt them, let alone the weight of it if it decided to ride a little longer.
An article
http://seattletimes.nwsource.com/htm...8_farm16m.html