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Are they as smart as dogs? I've never heard that and never watched them. What do they do in a day?

In both the Nahuatl speaking areas of Mexico and the Mayan areas of Mexico and Central America, dog was one of the most common meats they ate. Pre-colombian era (pre-1492).

It's just another animal, but one we've as a society put in a special category. But if you're ok eating pig, cow, turkey, whatever, you should be ok eating dog.

Check this BBC documentary for example:

actually i do have problem eating those too. But you're right, i did in fact never been with a pig a whole day.
still, i don't think we can compare dog to pigs but you get your point. We are sensitive on what we are emotionally affected to .. and what we know.

It's really no difference when it comes to eating dog vs pigs. It all depends on the culture you come from.
Pigs are very smart animals indeed. And the western food industry is really horrible when it comes to animal welfare.