If the horse neighs, we need to find a sound the pig makes. As a kid you usually hear people say to you "The horse goes neigh, the sheep goes baa, the cow goes moo, and the pig goes ____" Even if they do indeed make sound from their snout they don't make a sound like "Neigh" in conclusion among the choices the only sound the pig makes that is usually put with "The horse goes neigh" would be Oink. The answer is Oink.