BUT, a dog is so much more work! You have to give them plenty of exercise or they become hyper, you have to bring them outside several times a day to do their business, you have to feed them a great quality diet, you have to train them constantly, and you have to spend huge amounts of time with them. I'm not saying it isn't worth it to have a dog, but dogs are in fact a lot more work than piggies.
I think that's really dependent on the breed. I have two greyhounds. They get 3 15 min walks/day, and 2 meals/day, and an annual checkup. Other than that, they are content to just lay in the same room with me, chewing on a toy now and then. A frozen stuffed kong really tires them out. I'd say the pigs are more "work" because walking the dogs is pleasant, but sweeping up pig poop is not.