I have come to decide that hunters often proclaim intended prey as "smart" anytime the prey doesn't stand broadside and wait to be shot.
Sometimes we think of wary animals as being smart, but then that makes paranoid people seem to be smart as well. ;)
Saw a recent episode of Pigman where he called some high fenced hogs stupid for not running. The hogs were probably just as intelligent as any other hogs, but no longer wary of people given how they were raised. So the notion of being 'smart' can be rather subjective.
So hogs are smarter than dogs and not as smart as chimps (from what I have read). On various scales, dogs are seen to be about comparable to a 2 year old child, chimps about like a 4 year old and hogs are more like a 3 year old, give or take, not that any of the egg heads have figured out non-biased ways to assess IQ in animals. Sometimes animals do well on one type of IQ test, but don't do well on another type. So coming up with relevant tests is difficult. This is an ongoing problem for human IQ tests as well.
What is funny to consider is how hogs with the approximate IQ of a 3 year old can outsmart hunters with an average IQ 2-3 times higher and with decades of experience. Which one is really smarter? After some unsuccessful hunts, I am not always sure...