Many meat eaters, when asked why they eat some animals and not others respond that they wouldn’t eat an intelligent animal, because it’s immoral.
Pigs are an inconvenient truth. They’re as clever if not cleverer than dogs, but outside of the Far East a dog is only on the breakfast table if he’s misbehaving, unlike pigs who are considered to be one of the most edible animals in the world.
A study by scientists from the universities of Lancaster and Edinburgh tested this inconsistency. In one study they established that many meat eaters consider the intelligence rule to be a very important one. However, subsequent studies found that while people think that learning about pig intelligence will lead to high levels of moral concern, when they themselves learn about pig intelligence, moral concern remains low.