Yep, pigs are highly intelligent. They've been shown to be able to learn how to use mirrors to locate food, are possibly capable of theory of mind, deception and visual perspective taking. Some of these can be disputed as associative learning but we're also finding out that the same can also be said of aspects of higher human cognition. And from work in machine learning, we know how far even just associative learning and pattern matching can take you.

This is a short survey article that goes into more detail on pig intelligence: http://www.sciencedirect.com/science/article/pii/S0960982210...